The man accused of firing at passengers on a Greyhound bus earlier this month acted so erratically that the California Highway Patrol sought a warrant to see if he was under the influence of drugs.
A search warrant sought by CHP in Kern County Superior Court requested blood and urine sample from Anthony Devonte Williams, a Maryland man who has been charged in the case.
The requesting officer said in the document that the suspect's "erratic behavior and willingness to shoot randomly inside a bus" led the officer to believe he may have been using a controlled substance.
Williams is being held without bail on charges of first-degree murder and five counts of attempted murder. He pleaded not guilty to the charges on Thursday.
The shooting occurred Feb. 3 as the bus was on Interstate 5 near Frazier Park. A woman was killed and five other people were wounded.