This is not me, but I do have a DS of a similar age who as far as I know hasn't done it, but I am under no illusion that this is something mine are immune from.
This is a DS of a friend, single parent (I am too and only mention it as it brings certain challenges that being part of a couple doesn't necessarily) and after a series of events it seems the DS has taken it about 5 times in the last 6 months. The DS has seemingly been relatively honest, it may be more but even this level of consumption is worrying enough.
What do you do? How do you make sure this doesn't happen again? You can't permanently ground a 16 yo can you?
Parent has had conversations about drugs from being much younger and the perils etc. but they clearly haven't worked.
What discipline works with a 16 yo?