(CNN) - In Arizona, it appears teen pot use is declining.
A new study from the Arizona Criminal Justice Commission says fewer teens are toking since a medical marijuana law went into effect in 2011.
It was a slight drop, in all students surveyed from 29.9 in 2010 to 28.7 in 2012.
And of all the teens surveyed, the majority said they got it from friends.
About 12 percent said they got pot from someone with a medical marijuana card.