Just hours after finishing an opening gig for Aerosmith on Saturday night in

West Palm Beach, Florida, one of Kid Rock's tour buses was pulled over by

Florida

police and searched for drugs, and a small amount of cocaine, a pair of

marijuana joints and $3,717 in cash in a metal briefcase were discovered,

according to a police report from the St. Lucie County Sheriff's Office.

Rock was not on the bus when it was stopped and searched on the turnpike, as

he was en route to Nashville on a plane. The St. Lucie County Sheriff's

Office charged Rock's personal assistant, Kevin J. McMahon, 36, with drug

possession. McMahon posted $16,000 bond on Sunday and was sprung from St.

Lucie County jail after being charged with one felony count of cocaine

possession and misdemeanor counts of marijuana and drug paraphernalia

possession.

The bus was stopped around midnight by a sheriff's detective and the Florida

Highway Patrol after receiving a tip from a motorist about drugs on board the

bus, the report stated. Rock (born Robert Ritchie) was not charged in the

incident.

After the bus was stopped, McMahon was asked to empty his pockets, in which

the officers found a piece of white paper containing a white powdery

substance that tested positive for the presence of cocaine, according to the

report. During a top-to-bottom search of the bus, the briefcase with the cash

was found in the back of the bus and a marijuana pipe and another joint were

later found in one of McMahon's bags.