@freemo "Did you say anything stupid? And by that I mean, did you say anything?" -- Best legally relevant line from Breaking Bad.
Seriously, deals are made after you have a lawyer.
A lesson from "The Lives Of Others": the guilty person, if interrogated, will cry or get emotional. The innocent will get angry. One thing hardened psychopaths have is the ability to display some "righteous anger" even if they are guilty as hell. That often gets them out of trouble.