Two arrested for spray-painting walls in Lake Worth, say deputies - Sun Sentinel

Caught in the act, pretty much. Click title for link. From the article:

With the in-car audio-video recording system activated, the pair leaned down and started whispering to each other, according to the report.
The teen said to Marcano that "they found the stuff in the (alleys) but not the ones of the roof tops," the report stated, although it wasn't clear from the report what exactly the teen was referring to.
The teen also said that the graffiti on Marcano's backpack resembled the graffiti on the walls, deputies said. The teen is also accused of saying that if he got out of jail that same night, he'd come back to spray paint more walls to make it appear as if somebody else had done the graffiti, the report said.
Inside Marcano's backpack, deputies said, there were six cans of spray paint and a small glass pipe with suspected marijuana residue.
Marcano faces charges of felony criminal mischief, possession of drug paraphernalia, and contributing to the delinquency of a minor.