Tests show that Caleb Floyd had twice the legal limit of marijuana in his system when he hit and killed 23-year-old Blake Gaston on October 4.
Gaston was riding his motorcycle and wearing a helmet on Northeast 10th Street near 102nd Avenue when Floyd made a left turn in front of him, causing their vehicles to collide, according to the Bellevue Police Department.
Gaston died of massive head trauma.
Toxicology tests indicate that Floyd's blood contained 9.8 nanograms of THC in his blood when a blood sample was taken more than three hours after the incident, reports say. The legal limit for driving is a THC level of 5 nanograms.
Police booked Floyd into King County Jail Thursday and he is held on $100,000 bail.