I don't know about that. We host sleep overs for our 11 year old and his friends fairly frequently. We are in the habit of insisting that when our son spends the night at his friends house that his parents refrain from heroin use.
Fortunately for us neither of the 2 families we do allow him to spend the night with are junkies, which is nice.
L
Funny, my children have managed to have friends whose parents refrain from shooting up also. I in turn extend them the same courtesy.