Governor Charlie Baker says he's concerned about people driving under the influence of marijuana.
The state yesterday launched a campaign seeking to deter people from driving while high.
State data shows that marijuana was the drug found most in drivers involved in deadly crashes in Massachusetts between 2012 and 2016.
Baker says he's concerned because there is no test associated with driving while high that will withstand a legal challenge at this time.
Meantime, Massachusetts is rolling out a new public information campaign discouraging people from driving drunk or stoned this holiday season.
The safe-driving campaign is the first since marijuana stores opened.
It emphasizes finding alternate transportation.
New Public Safety Secretary Thomas Turco said in a statement that 79 people were killed by impaired drivers in 2016.