Never talk to a cop... now to a FBI agent for sure. They will make things up and repeat questions to check for inconsistencies and get you on lying
This is the advice that I would tell anyone. Just think of all the things Hoover did. I believe it's much worse now. I truly am fearful of my own government - something I never thought about growing up in this country. I was taught to think that 'if you've done nothing wrong, you don't have anything to worry about'. That's clearly not true.