Police say marijuana use might have been a factor in a head-on crash that injured three men about 11 p.m. Wednesday in Greenfield. Jeffrey M. Franklin, 26, of Greenfield was in critical condition after his Chevrolet Malibu collided with a Mazda 6 on State Road 9. A baggy of pot was found in Franklin’s vehicle. The 18-year-old driver of the Mazda and his 26-year-old passenger were in serious condition. All three men were flown by helicopter to the hospital.