What if you kid was doing drugs what would you do?

My first reaction would be shock but I think I would look into finding a place to try and rehabilitate them because this is no way to live . But the problem is if they don't want the help even sending them for rehabilitation will not work . They have to want to quit themselves and this would be the hard part to deal with , it they were not willing to try to give it up . It is dangerous to their health not to mention that is illegal and I would hate to have to visit them in jail and the cost this would be to them . There are so many reasons why I hope this never happens to any of my children .