Dear Beth
The first consideration is your safety and well-being. The worst case is if your son or his friends act out against you or your property. You can't control a rampaging tiger. He is beyond the ability to control. This is a drug-fueled spree. The only way it stops if he is caught by the police or he runs out of drugs, support and options.
That said, if it is safe to do so I would confiscate any electronic means of communication devices left in the home. Like the Ipad. If you bought the phone and pay for the service, they are yours. If you believe your son won't hurt you I would consider taking those, if he returns
It seems you are a mother alone, like me. It is very hard to be in this spot. Your son is 15. When he turns 16 he can go to Job Corps. If you live in the United States he can be yanked from his public school and sent to the school for the kids with serious behavioral problems, which I suggest. There will be stricter supervision, he will be away from his homey's and there are not the perks. He needs everything to be tighter. I would suggest telling him that if this continues, you will be seeking out of home placements for him, including drug treatment.
Job Corp programs are free. There is drug treatment. It is room and board. They finish high school and get good training. If it were me, I would sit him down and state the obvious. He is out of control and you will seek alternatives. The situation as it is won't continue..
Pretty soon he will be in trouble with the law. This is not the worst thing. This way he will be curbed and contained. Until he commits a crime I don't think the police will take it seriously.
Again let me stress that your safety is first and foremost. I don't know if he's violent or abusive. But if it is safe, I would restrict his access to the house, alone. I would be careful about locking him in at night because this could be a safety hazard. I would recognize that you can't control or contain him. I would not go to war on this. You can't protect him. He will run into a brick wall, sooner or later.But you don't have to make it comfortable. You don't have to give him all of the luxuries while he is running wild.
Many times I went to the police and I discussed this with them. There are juvenile officers. I wouldn't hesitate to call them and make sure your son is on the radar. Even though they may not act as you believe they should, when they should, that they know what is going on, blow by blow and that you ask their advice, to me, makes sense.
The police ALWAYS supported my son and took a position against me. (As I thought. ) But I called every.single.time. Right is right.
I am so sorry this is happening. Please keep posting. It helps.