Cassidy was just chillin' in a parked van outside his house when cops busted him -- which they say has more to do with the joint and baggie full of marijuana allegedly in the van.
The Philly MC was busted Sunday afternoon in Jersey City when police say they spotted him in the vehicle, and noticed a strong marijuana odor. Officers say there was a joint sitting in clear view on the dashboard. They also found a baggie of weed and a grinder, typically used to crush weed ... according to the police report.
Cassidy was booked for possession of marijuana and drug paraphernalia.
Law enforcement tells us they discovered Cassidy has an outstanding warrant in another county -- for the exact same offenses. So, now he has 2 court dates ... for the old and new charges.
The lesson? Don't park and smoke. Allegedly.