Why Did Cops Detain Dupri?

5/9/2007 2:54 PM PDT

Why Did Cops Detain Dupri?

TMZ obtained video of a traffic stop yesterday in West Hollywood. It shows Jermaine Dupri in the back of an L.A. County Sheriff's car.

Dupri's Lamborghini was near the squad car, doors wide open. After a while, deputies let Dupri leave. It is unclear if Dupri, Janet Jackson's fiance, was cited for anything. It is also unclear why deputies detained him, and why they let him drive away.

We contacted the Sheriff's Dept. West Hollywood substation but the watch commander had no info on the stop.

Dupri's peeps did not return our calls.