No. You have no solid proof. Wait until he's 18 then ask him to leave. Family counseling is needed.
My son just bought a really nice car but I think he got the money selling drugs should I kick him out he's 17. And kinda shady to begin with?
He's still a minor and your responsibility until he's 18. If you think he's doing illegal things ... Be a parent and take more control over him. It's your job to know what he's doing.
Search his room search his car u will find evidence tell him drug rehab or on the street
Selling =/= using. Commend his entrepreneurial spirit and teach him that there are other things he can sell or hustle to make a dime. Something that's rewarding both in money and for the soul. That brings smiles all around. That makes the world a better place.
Build on his strengths. Kicking someone out because you disapprove of their action is just bad parenting. Unless you're not trying to be a parent.
If he is 17 and living at home, you should be able to narrow down his source of income or other money with which he purchased the car.
I'd seek advice from either a juvenile lawyer and / or a professional counselor to evaluate your options.
That's what I would do if I were in your situation.
If your son is living at home and is still a dependant minor .. You should know what he's making and filing on his tax returns (if he files on his own). Does he have a job? Do the math. If he can't verify where he got the funds from .. Then investigate it. You are still the parent .. He is still the child.
He would need to have a pretty good job to not have to get a loan to buy an expensive car .. AND .. pay high insurance coverage for a teen male. Where is he getting money for that? He DOES have insurance .. right?
If you suspect something is funky .. investigate it and parent him .. don't enable something shady .. not even a little bit.