I've been a fan of cop shows for years, "Homicide: Life on the Street" is my favorite, I spent years watching "NYPD Blue", and now I find "Cold Case" good Sunday evening TV.
The most important lesson I've learnt from watching people pretend to be police officers is don't say anything to the police. Telling them you killed so-and-so when they're just fishing isn't going to do you any good. Get a lawyer. Who said TV wasn't educational?