How does a parent convince a teenager that he is making horrible choices?

The details: My partner has a 15 year old son—I’ll call him Keith. In the past 9 months, Keith has:

1. stolen my car several times to sneak out at night
2. gotten involved with drugs- starting with pot and alcohol then moving to acid, ‘dipped’ joints, and God knows what else
3. been caught by the police with my car, which was impounded—he got a ticket with 4 charges but the judge reduced it to 1 charge- Keith thought it was amusing
4. stole my car again, even after being caught and disciplined
5. stole his mother’s car and drove 30 miles, unlicensed
6. has had liaisons with at least 9 girls, treating them badly after
7. disappeared for 11 hours, was found by the police at 2AM on his way home from a party

The most upsetting part, for his dad, is how Keith has absolutely no empathy or remorse. Keith lies about his actions—even when he knows the lie is obvious, insulting our intelligence, he will still lie, acting with full conviction that he’s telling the truth. Keith lies so much and so often that it has become a scary norm.

So many of us in the family have had long talks with him- his parents have tried several strategies to get through to Keith. His mom has put him in counseling. Keith told us flat out that he found our frustration and anger amusing and that counseling was a joke. Keith told his dad that we all were being silly and overreacting, and that he will do what he wants when he wants.

His dad has taken away all his electronics, but Keith still finds ways to get on FaceBook to message his friends and make plans. We just realized his PlayStation could access FaceBook.

The last straw—Keith was caught running acid at his school and is being charged with a felony. He’s suspended from school as well.

I’m concerned that he is a sociopath, but he doesn’t meet all the characteristics of a sociopath. Keith’s always been overly entitled, selfish, arrogant, and spoiled, but the dangerous behavior only started in January. For me, it’s frustrating because this kid’s not my creation, but definitely affects me since he lives with us.

My question…. has anyone else had a difficult child, or been that difficult child? What strategies have worked? What won’t work? What suggestions does the collective have?

Thanks, all, in advance.