A man arrested on rapper Nelly's tour bus has pleaded not guilty to a charge of drug possession after border patrol officers allegedly found him with a stash of heroin and marijuana.

The star's friend and staff member Brian Keith Jones was detained after officials uncovered the drugs during a routine vehicle search in Sierra Blanca, Texas on Thursday morning (11Oct12).

Jones pleaded not guilty to a drug possession charge on Friday (13Oct12) and was released on bail, according to Tmz.com.

Nelly previously insisted he had no idea the drugs had been brought onboard his tour bus, and revealed he is "mad as hell" over the incident.