Exactly. First step should be taking away the phone. If they find another way to continue, cut the money off. No shopping trips with the girls, no movies, not even burgers and fries with friends, nothing.
Yup
When my gf found out her 16 yr old son was doing MJ, she and her husband cleaned out his bedroom. He only had a sleeping bag and pillow for a month. He had to take daily piss tests. He had to earn things back into his room. It worked. He straightened out, grades improved, dropped old friends made new ones and is in college and doing great.