His book is also a must read.
en.m.wikipedia.org
The pdf is available online if you google it.
Yes, I also have that on my Kindle app.
Everything he says is right. The cop is part of prosecution and is by legal definition and function adversarial. He can only provide evidence. He cannot give an opinion on your innocence or say anything to help you. That is considered hearsay.
It does not matter if you went to school with the guy. One of my classmates became a cop, and eventually, an investigator. But if he detained and questioned me, he cannot be my friend from high school. He has to gather evident to prosecute me.
Anything you say
WILL be used against you. Forget the word "can." The one piece of advice attorneys most often give is shut up.
So, the pot brothers have it right. STFU.
When you pull away after a traffic stop and the cop remains, it is because he is writing down everything you said and did on the back of his copy of the citation. If it goes to court, he has notes he made moments after the incident.
Quite possibly, you might be arrested for something. The less you say, it easier the job that your attorney has.
I am getting off in the weeds, I know. Let's say that you shoot someone in self-defense or defense of another life.
Don't talk about how you shot someone. Call the police, report the shooting. Don't have the weapon in your hand when they arrive.
Don't answer questions until you have an attorney present. They will collect the gun and other evidence. They may gather reports from bystanders.
Keep shutting up.
You will probably be arrested and may spend some time in jail. But it is different than a few decades in prison.
Become practiced in the art of shutting up.