I know some landlords don't require tenants to sign anything (no lease). So what is the minimum necessary for a tenant not to be charged with breaking and entering (or unlawfully living in the home) if the landlord decides to kick them out? For example if a person has already moved in without signing anything, and subsequently the landlord wants them to sign a lease, but the tenant refuses to do so, is the tenant still protected by tenancy laws or can the landlord phone the cops right away and have the "trespasser" removed from the house? As long as a person has demonstrated that they initially had permission to live in the property, do they have some claim to continue to do so until the eviction process is completed?
The worst case scenario I can think of is if the tenant moves in with a verbal agreement from the landlord that no lease will have to be signed, he hasn't paid rent yet, and hasn't received a key and the landlord says "I changed my mind; you have to move out."