A Colchester resident was charged with possession of cocaine, ecstasy, Clonazepam and marijuana on Tuesday after officials tested the substances he had in his possession during an April 2 collision, according to a Vermont State Police press release.

Police say 29-year-old Christopher S. Keller had 13 individually wrapped plastic sandwich bag corners of a white powdery substance when his car rolled over on Interstate 89 southbound in Richmond.

Tests conducted by the Vermont Forensic Laboratory determined the substances found included 12 grams of powder cocaine, MDMA or ecstasy, the regulated drug Clonazepam and a “civil amount” of marijuana, police said.

Keller attempted to run from the crash scene down the interstate, according to the press release. A preliminary roadside test determined Keller’s blood alcohol content was .119 percent, the release said.

Based on the test results, police say additional drug charges will be filed with the Chittenden County state’s attorney.

Keller has already been arraigned on charges of DUI, negligent operation and leaving the scene of a collision, VSP said.