Coolio -- The Drugs Weren't Mine!

Coolio claims the cocaine he was busted with at LAX wasn't his -- because only an "idiot" would try to get coke past airport security, and he's no fool.

Coolio: Click to watch
The rapper with the crazy hair was back at the scene of the alleged crime yesterday, where he said he wished the police had done a little more "CSI"-style investigating when he got popped -- to check for his DNA on the drugs they found in his bag.

Coolio's already pled not guilty in court, and his closing argument yesterday: "I don't give a f**k."