Let’s say a co-ed has been found dead. The police have established she was last seen alive at a frat party a few nights back. The police round up the people who were at the party and ask them what they remember about the night of the party. Things like did they know the victim; did they see her leave; did they see who she spent time with; did they see anyone giving her a hard time; etc.
Most of the people answer the detectives’ questions. But one student immediately tells the detective that he wants a lawyer and refuses to say anything else.
Guess who just moved from being a witness to being a suspect.