Quote from Adrian Monk in Mr. Monk and the Kid
Lab Tech: It's not tree sap. We already ran it. The main component is abietic acid. Adrian Monk: Abietic acid? That's violin rosin. Natalie: I think that's pretty expensive rosin. It's for professionals. Adrian Monk: So professional, or at least very serious violinist. Captain Stottlemeyer: Yeah. Adrian Monk: 25 years of age, who is missing.