POLICE FIND GUN AND HEROIN ON NELLY'S TOUR BUS

Nelly landed in a derrty dilemma while crossing the border Wednesday night (Oct. 10).

A loaded gun, heroin and massive amounts of weed were seized from the Country Grammar rapper's tour bus, authorities told TMZ. A police dog detected the drugs at a checkpoint in Sierra Bianca--the same stop that has busted Willie Nelson and Snoop Dogg for drug possession--after Nelly's bus was halted by cops.

The search produced 36 small bags of heroin (totaling .64 ounces), over ten pounds of marijuana in a large green duffel bag and a loaded .45 caliber pistol.

Law enforcement officials said a passenger named Brian Keith Jones admitted the drugs and gun were his and was subsequently placed under arrest. Nelly and the other five on the bus were released.