Dourdan is known as Warrick Brown on the Las Vegas version of CSI
Actor Gary Dourdan, who stars in TV show CSI: Crime Scene Investigation, has been arrested on suspicion of drug possession, police have said.
The 41-year-old was held after being found asleep in a parked car in Palm Springs, California.
Police allegedly found substances believed to be cocaine, heroin and ecstasy in the vehicle.
The star was jailed for about five hours before being released on bail of $5,000 (£2,500).
The car had been parked on the wrong side of the street with its inside light left on, according to a police press release.
This said Dourdan appeared to be disoriented and "possibly under the influence of alcohol and/or drugs" when approached by an officer.
Various prescription-only drugs, and items relating to drugs, were allegedly also found.
A native of Philadelphia, Dourdan found fame on the TV sitcom A Different World, a spin-off from The Cosby Show.
He is best-known for his role as forensics investigator Warrick Brown on the Las Vegas version of CSI, which has been the most-watched drama on US television for much of its time on-air.
Dourdan is expected to leave the programme next month, at the end of its eighth series.
A spokesman for television network CBS, which broadcasts the three CSI programmes, had no comment to make on the arrest, while the actor's agent was not immediately available to respond.