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When can a civilian use physical force on someone? Are there any other times besides in self defence? Is it legal to use physical force in the event of an emergency, for example if you shove someone out of the way of a car and they end up falling and breaking their ankle, can you get sued?

What if you see someone running out a store and people running after them, so you grab them, but it turns out they weren't actually robbing anything?

Interesting story: I was on a bus and an altercation occurred between the bus driver and someone who got on with an expired ticket or something like that. It started by arguing, but then the bus driver shoved the passenger off the bus. Then the passenger punched the bus driver hard in the face. Then it was a full fight. The police arrived and put the passenger in handcuffs, and it seemed like witnesses took different sides as to who started it.

Was it legal for the bus driver to shove the passenger off the bus for not paying? Was it self defense that the passenger hit the driver back? I know some bus companies have policies telling the drivers not to get physical, just call the police if there's a problem.

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    The question is probably overbroad and unfocused applied to myriad different fact patterns, but I've provided the general rules.
    – ohwilleke
    Sep 20, 2022 at 17:54

3 Answers 3

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Battery – offensive, nonconsensual contact with another person – is a crime unless it is justifiable. There are numerous justifications, and the standards for them can vary.

For example, is a justification for battery, and the standard is usually the "reasonable person." I.e., would a reasonable person in the position feel that force was necessary to defend against imminent injury, and was the force used reasonable and proportional to the perceived threat?

Force can be used to effect a lawful . The standards for arrest are different for police officers. For example, police typically need only have "probable cause" (i.e., a justifiable belief that a person likely committed a crime) to effect an arrest, and at the point police are typically allowed to use any force necessary to effect the arrest. On the other hand, "citizens' arrests" are typically limited to more serious suspected crimes and, in practice if not in theory, subject to higher levels of scrutiny.

So, for example, a cop grabbing the person being chased from a store would almost certainly be immune to charges of battery. A bystander doing the same thing would have to be prepared to justify his interference in civil, if not criminal, court.

Some jurisdictions accord a higher right to use force to owners of property. For example, "shopkeeper's privilege" allows merchants to use reasonable force to detain individuals they reasonably believe to have stolen from them. "Castle doctrine" allows people to use lethal force against any intruder in their residence.

In the bus fare scenario you describe the bus driver is guilty of battery. Even if a prosecutor declined to charge him for the crime, the victim of that battery could sue the driver civilly. Likewise, the passenger who chose to subsequently attack the bus driver is guilty of battery, because (presumably) there was no ongoing physical threat once he was off the bus.

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  • I would assume that in most if not all jurisdictions a property owner or a person with some interest in property, e.g. a tenant, (i.e. land) can legally use some level of force to remove a trespasser.
    – bdsl
    Sep 8, 2017 at 22:57
  • @bdsl - Aside from the explicit rights to assault and batter trespassers being enumerated in many "Castle doctrine" laws, I can't offhand think of any laws that justify "forcible removal of a trespasser," though it does seem like something that should exist. That would make a good question here!
    – feetwet
    Sep 8, 2017 at 23:54
  • @bdsl See Canadian Criminal Code § 35.
    – ohwilleke
    Sep 20, 2022 at 19:21
  • @feetwet It's certainly the law in England and Wales that a property owner can use reasonable force to eject a trespasser. It's pretty much the entire point of property law, which has existed for a lot longer than police forces have.
    – bdsl
    Sep 20, 2022 at 19:42
  • @bdsl the main point of property law is to govern the determination of whose property a given piece of land is and transfers from one person to another. How trespassers may or may not be dealt with is not really an element of property law.
    – phoog
    Sep 20, 2022 at 21:20
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The rule is simple: you can use non-lethal force to arrest someone if you personally witnessed them committing a felony or you have a strong and incontrovertible reason to think that they have just committed a felony.

In the case you cite of the bus driver, the law in the United States and Canada allows a property owner or their designated agent the right to use reasonable force to expel an unwanted intruder. Whether a shove constitutes reasonable force would be for a jury to decide. If I were the juror I would consider a shove that did not throw the intruder to the ground to be reasonable, but if the shove was so violent that it hurt the intruder or threw them to the ground, then it would be excessive.

The attack of the intruder on the bus driver was felony assault and battery. Self defense does not mean you can retaliate against someone who is no longer attacking you.

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In Canada, criminal law is national law rather than provincial law.

There are several categories of justification of use of form in Canadian criminal law, including aiding a peace officer at the officer's direction, which are comprehensively summarized in the following statutory sections.

The Canadian criminal code states (also here and here) (emphasis and captions not indented are mine):

General Principles

25 (1) Every one who is required or authorized by law to do anything in the administration or enforcement of the law

(a) as a private person,

(b) as a peace officer or public officer,

(c) in aid of a peace officer or public officer, or

(d) by virtue of his office,

is, if he acts on reasonable grounds, justified in doing what he is required or authorized to do and in using as much force as is necessary for that purpose.

(2) Where a person is required or authorized by law to execute a process or to carry out a sentence, that person or any person who assists him is, if that person acts in good faith, justified in executing the process or in carrying out the sentence notwithstanding that the process or sentence is defective or that it was issued or imposed without jurisdiction or in excess of jurisdiction.

(3) Subject to subsections (4) and (5), a person is not justified for the purposes of subsection (1) in using force that is intended or is likely to cause death or grievous bodily harm unless the person believes on reasonable grounds that it is necessary for the self-preservation of the person or the preservation of any one under that person’s protection from death or grievous bodily harm.

(4) A peace officer, and every person lawfully assisting the peace officer, is justified in using force that is intended or is likely to cause death or grievous bodily harm to a person to be arrested, if

(a) the peace officer is proceeding lawfully to arrest, with or without warrant, the person to be arrested;

(b) the offence for which the person is to be arrested is one for which that person may be arrested without warrant;

(c) the person to be arrested takes flight to avoid arrest;

(d) the peace officer or other person using the force believes on reasonable grounds that the force is necessary for the purpose of protecting the peace officer, the person lawfully assisting the peace officer or any other person from imminent or future death or grievous bodily harm; and

(e) the flight cannot be prevented by reasonable means in a less violent manner. . . .

25.1 (1) The following definitions apply in this section and sections 25.2 to 25.4. . . .

(10) A person who commits an act or omission that would otherwise constitute an offence is justified in committing it if

(a) a public officer directs him or her to commit that act or omission and the person believes on reasonable grounds that the public officer has the authority to give that direction; and

(b) he or she believes on reasonable grounds that the commission of that act or omission is for the purpose of assisting the public officer in the public officer’s law enforcement duties.

(11) Nothing in this section justifies

(a) the intentional or criminally negligent causing of death or bodily harm to another person;

(b) the wilful attempt in any manner to obstruct, pervert or defeat the course of justice; or

(c) conduct that would violate the sexual integrity of an individual.

(12) Nothing in this section affects the protection, defences and immunities of peace officers and other persons recognized under the law of Canada. . . .

26 Every one who is authorized by law to use force is criminally responsible for any excess thereof according to the nature and quality of the act that constitutes the excess.

Use Of Force To Prevent A Crime

27 Every one is justified in using as much force as is reasonably necessary

(a) to prevent the commission of an offence

(i) for which, if it were committed, the person who committed it might be arrested without warrant, and

(ii) that would be likely to cause immediate and serious injury to the person or property of anyone; or

(b) to prevent anything being done that, on reasonable grounds, he believes would, if it were done, be an offence mentioned in paragraph (a).

Use Of Force On Aircraft In Flight

27.1 (1) Every person on an aircraft in flight is justified in using as much force as is reasonably necessary to prevent the commission of an offence against this Act or another Act of Parliament that the person believes on reasonable grounds, if it were committed, would be likely to cause immediate and serious injury to the aircraft or to any person or property therein.

(2) This section applies in respect of any aircraft in flight in Canadian airspace and in respect of any aircraft registered in Canada in accordance with the regulations made under the Aeronautics Act in flight outside Canadian airspace.

Use Of Force To Carry Out An Arrest Warrant

28 (1) Where a person who is authorized to execute a warrant to arrest believes, in good faith and on reasonable grounds, that the person whom he arrests is the person named in the warrant, he is protected from criminal responsibility in respect thereof to the same extent as if that person were the person named in the warrant.

(2) Where a person is authorized to execute a warrant to arrest,

(a) every one who, being called on to assist him, believes that the person in whose arrest he is called on to assist is the person named in the warrant, . . .

is protected from criminal responsibility in respect thereof to the same extent as if that person were the person named in the warrant.

29 (1) It is the duty of every one who executes a process or warrant to have it with him, where it is feasible to do so, and to produce it when requested to do so.

(2) It is the duty of every one who arrests a person, whether with or without a warrant, to give notice to that person, where it is feasible to do so, of

(a) the process or warrant under which he makes the arrest; or

(b) the reason for the arrest.

(3) Failure to comply with subsection (1) or (2) does not of itself deprive a person who executes a process or warrant, or a person who makes an arrest, or those who assist them, of protection from criminal responsibility.

Use Of Force To Stop Breach Of The Peace

30 Every one who witnesses a breach of the peace is justified in interfering to prevent the continuance or renewal thereof and may detain any person who commits or is about to join in or to renew the breach of the peace, for the purpose of giving him into the custody of a peace officer, if he uses no more force than is reasonably necessary to prevent the continuance or renewal of the breach of the peace or than is reasonably proportioned to the danger to be apprehended from the continuance or renewal of the breach of the peace.

31 (1) Every peace officer who witnesses a breach of the peace and every one who lawfully assists the peace officer is justified in arresting any person whom he finds committing the breach of the peace or who, on reasonable grounds, he believes is about to join in or renew the breach of the peace.

(2) Every peace officer is justified in receiving into custody any person who is given into his charge as having been a party to a breach of the peace by one who has, or who on reasonable grounds the peace officer believes has, witnessed the breach of the peace.

Use of Force To Suppress A Riot

32 . . .

(4) Every one who, in good faith and on reasonable grounds, believes that serious mischief will result from a riot before it is possible to secure the attendance of a peace officer is justified in using as much force as he believes in good faith and on reasonable grounds,

(a) is necessary to suppress the riot; and

(b) is not excessive, having regard to the danger to be apprehended from the continuance of the riot.

(5) For the purposes of this section, the question whether an order is manifestly unlawful or not is a question of law.

33 (1) Where the proclamation referred to in section 67 has been made or an offence against paragraph 68(a) or (b) has been committed, it is the duty of a peace officer and of a person who is lawfully required by him to assist, to disperse or to arrest persons who do not comply with the proclamation.

(2) No civil or criminal proceedings lie against a peace officer or a person who is lawfully required by a peace officer to assist him in respect of any death or injury that by reason of resistance is caused as a result of the performance by the peace officer or that person of a duty that is imposed by subsection (1).

(3) Nothing in this section limits or affects any powers, duties or functions that are conferred or imposed by this Act with respect to the suppression of riots.

Use Of Force In Cases Involving Drunks

(Basically, one can use force against a drunk for doing something that would be a crime if they weren't drunk, even if being drunk deprives the drunk of the necessary intent to commit that crime.)

33.1 (1) A person who, by reason of self-induced extreme intoxication, lacks the general intent or voluntariness ordinarily required to commit an offence referred to in subsection (3), nonetheless commits the offence if

(a) all the other elements of the offence are present; and

(b) before they were in a state of extreme intoxication, they departed markedly from the standard of care expected of a reasonable person in the circumstances with respect to the consumption of intoxicating substances.

(2) For the purposes of determining whether the person departed markedly from the standard of care, the court must consider the objective foreseeability of the risk that the consumption of the intoxicating substances could cause extreme intoxication and lead the person to harm another person. The court must, in making the determination, also consider all relevant circumstances, including anything that the person did to avoid the risk.

(3) This section applies in respect of an offence under this Act or any other Act of Parliament that includes as an element an assault or any other interference or threat of interference by a person with the bodily integrity of another person.

(4) In this section, extreme intoxication means intoxication that renders a person unaware of, or incapable of consciously controlling, their behaviour.

Use Of Force In Defense Of Persons

34 (1) A person is not guilty of an offence if

(a) they believe on reasonable grounds that force is being used against them or another person or that a threat of force is being made against them or another person;

(b) the act that constitutes the offence is committed for the purpose of defending or protecting themselves or the other person from that use or threat of force; and

(c) the act committed is reasonable in the circumstances.

(2) In determining whether the act committed is reasonable in the circumstances, the court shall consider the relevant circumstances of the person, the other parties and the act, including, but not limited to, the following factors:

(a) the nature of the force or threat;

(b) the extent to which the use of force was imminent and whether there were other means available to respond to the potential use of force;

(c) the person’s role in the incident;

(d) whether any party to the incident used or threatened to use a weapon;

(e) the size, age, gender and physical capabilities of the parties to the incident;

(f) the nature, duration and history of any relationship between the parties to the incident, including any prior use or threat of force and the nature of that force or threat;

(f.1) any history of interaction or communication between the parties to the incident;

(g) the nature and proportionality of the person’s response to the use or threat of force; and

(h) whether the act committed was in response to a use or threat of force that the person knew was lawful.

(3) Subsection (1) does not apply if the force is used or threatened by another person for the purpose of doing something that they are required or authorized by law to do in the administration or enforcement of the law, unless the person who commits the act that constitutes the offence believes on reasonable grounds that the other person is acting unlawfully.

Use Of Force To Defend Property

35 (1) A person is not guilty of an offence if

(a) they either believe on reasonable grounds that they are in peaceable possession of property or are acting under the authority of, or lawfully assisting, a person whom they believe on reasonable grounds is in peaceable possession of property;

(b) they believe on reasonable grounds that another person

(i) is about to enter, is entering or has entered the property without being entitled by law to do so,

(ii) is about to take the property, is doing so or has just done so, or

(iii) is about to damage or destroy the property, or make it inoperative, or is doing so;

(c) the act that constitutes the offence is committed for the purpose of

(i) preventing the other person from entering the property, or removing that person from the property, or

(ii) preventing the other person from taking, damaging or destroying the property or from making it inoperative, or retaking the property from that person; and

(d) the act committed is reasonable in the circumstances.

(2) Subsection (1) does not apply if the person who believes on reasonable grounds that they are, or who is believed on reasonable grounds to be, in peaceable possession of the property does not have a claim of right to it and the other person is entitled to its possession by law.

(3) Subsection (1) does not apply if the other person is doing something that they are required or authorized by law to do in the administration or enforcement of the law, unless the person who commits the act that constitutes the offence believes on reasonable grounds that the other person is acting unlawfully.

Discipline of Children

43 Every schoolteacher, parent or person standing in the place of a parent is justified in using force by way of correction toward a pupil or child, as the case may be, who is under his care, if the force does not exceed what is reasonable under the circumstances.

Use Of Force In Surgery

45 Every one is protected from criminal responsibility for performing a surgical operation on any person for the benefit of that person if

(a) the operation is performed with reasonable care and skill; and

(b) it is reasonable to perform the operation, having regard to the state of health of the person at the time the operation is performed and to all the circumstances of the case.

Most of the scenarios in the question are clearly covered above, and these defenses also eliminate civil liability.

Is it legal to use physical force in the event of an emergency, for example if you shove someone out of the way of a car and they end up falling and breaking their ankle, can you get sued?

This is almost surely legal, even though Section 34 of the Canadian Criminal Code would have to be twisted slightly in interpretation to cover this scenario. Section 34 doesn't state that the use or threat of use of physical force has to be a crime, or even that it has to be used against the person who is the source of the threat or use of force.

Canadian law would avoid an absurd interpretation in this circumstance.

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