How do i deal with this?

i have a 15 year old son and he has the worse mouth i ever heard and he startin to use drugs , im a single father my wife ped away 9 months ago and she handlled all the kids ,my son was expelled from school 2 months ago for his month ,i dont want him to go to jail but he saya he dont care i just dont know what to do anymore theres more but i dont have enough room,