Let's say that an individual, let's call him Bob, has been contacted by the police who want to speak to him about an associate of his that was recently murdered. Bob is not under arrest, but Bob knows that the police may consider him a potential suspect.
Any lawyer worth their salt would say Bob should not speak to the police at all, and that is no doubt the safest action. However, if Bob doesn't speak with the police he can't provide them with any relevant information he may have about his associate, information that could assist the police in finding the associate's actual murderer.
So let's say Bob decides to speak to the police anyways, despite knowing the safest option is not to talk to them at all, in order to share some details he believes are relevant to the case and wants them to know. How can he go about doing so in the safest manner to him?
I imagine hiring a lawyer before speaking to the police would be the best option, but let's say Bob is poor and can't afford the cost of hiring a lawyer, and he can't find a pro bono lawyer either. If Judicial proceedings had started Bob would have a right to an attorney, but since he is only officially a person of interest at this point he would not be provided an attorney either. So what can he do to protect himself when attempting to assist the police?