He faces up to 378 years in prison.
The toxicology report for Zhukovskyy showed he was positive for an unspecified drug that made him incapable of driving safely when his pickup truck crossed the center yellow line and crashed into the motorcyclists.
Zhukovskyy also said that he reached for a drink on the passenger side of the truck just before the crash, according to the report. That violation was labeled as "inattentive driving."
The crash sent shock waves through New England’s community of motorcycle enthusiasts and military veterans, which sometimes overlap. The crash involved members of Marine JarHeads MC, a motorcycle club in New England that includes Marines and their spouses.
“When something like this happens, we all feel it,” said Cat Wilson, who organizes a motorcycle charity event in Massachusetts and is a friend of some of the crash victims. “There is no tighter community than our biker community.”
The Associated Press contributed to this report.