Yes... then they can sell to a friend if they want but it would help to preclude "dealers" selling to kids... something to be avoided. There needs to be a recourse in such a situation when the details get cloudy.

BTW... I knew a lad who once bought some homegrown from a Yank draft dodger in the hills north of Saint John, NB. Quite a story, but the money was "$20 okay man?" It was the size of a large Ziplock freezer bag about 3" in diameter. I'd say close to 4 ounces. My buddy nearly broke his wrist getting his wallet out. It was good shit, so he told me.