"He is back on set," the source said.
Dourdan, who plays Warrick Brown on the CBS hit, was arrested on Monday morning and back on the set as early as Tuesday, the source says.
Dourdan, 41, was spotted sleeping in his car on the wrong side of the street shortly after 5 a.m. Monday in Palm Springs, Calif. He was found in possession of suspected cocaine, heroin, ecstasy and prescription pills, police say. Dourdan posted $5,000 bail and was released.
The actor has not been formally charged. His arraignment is set for May 28.