Homicide: Life on the Street Season 7 Episode 19

Munch: I'm not gonna start a murder investigation without witnesses, without a crime scene, without relevant information as to why that body is in that hallway, on that gurney to nowhere.
Griscom: It's a mystery, don't detectives like mysteries?
Bayliss: No, actually we hate a mystery. What we like is when a case makes immediate sense and we're able to lock someone up right away.
Munch: There are rules to this business, fundamentals. The phone rings, we pick it up, we write down an address and we go to where that person was murdered.
Bayliss: Hum-hum, i.e. the crime scene.
Munch: Exactly, that's what we call it the crime scene. We go and evaluate and canvas, the crime scene, hoping for witnesses.
Bayliss: Living, breathing witnesses.
Munch: We come to the morgue only after we have processes and canvassed the crime. We do not come to the morgue to make the acquaintance of fresh murders.
Bayliss: Yeah, that'd be stupid.
Griscom: All of this is stupid.
Munch: Well call us when it's less stupid.
Griscom: Where are you going?
Munch: When you can tell us where that body came from I will go to that place and start an investigation, until then it's not our case.
Griscom: Who's case is it?
Bayliss: Well they say that possession is nine tenths of the law.