Star Trek: Deep Space Nine1993

[the crew are analyzing Illario's death]

Chief O'Brien:
[scanning the corpse] That's odd... According to these readings, the bullet only traveled eight or nine centimeters.

Captain Sisko:
Then the killer must have fired at point blank range.

Odo:
I don't think so. There are no powder burns on the body.

Doctor Bashir:
What are powder burns?

Odo:
At close range, chemically propelled weapons leave residual combustion products on the skin and clothing of the victims.

Captain Sisko:
How did you know that?

Odo:
I read 20th century crime novels - Raymond Chandler, Mike Hammer, that sort of thing.