You don't do anything. You've done your job and taught him. You need to transition out of the lecture and punishment business. Now they have to *learn.* They mess up, they have to suffer the consequences.
Not letting him use your car makes a lot of sense. It isn't punishment - it's consequence for showing poor judgment.
Exactly. Mom, I know you mean well and you only want the best for your child, but he/she is not a child anymore. You need to just keep your mouth shut and let your child deal with the consequences of his/her behavior.
I also agree with this poster about use of the car.He is proving untrustworthy and immature in his decision-making skills. My oldest DS23 got a serious speeding violation when he was 19. Going 25mph over the limit in a school zone--at 8:15 a.m.

He was totally blase about it, too, ordering me to call an attorney. Um, no, son, that's not how it works. You do the crime, you do the time. Hardest thing I ever had to do was let the chips fall where they may. I did go with him to court, but did not speak to the judge during his case. After she sent him on his way(with thankfully, NO jail time) she called me aside and told me to get him off my insurance and turn the car over to him ASAP, before he hurt someone and they bring judgement against US(with deeper pockets than a 19yo.) We had already planned to give him the old truck(no comments please, this was a good decision in the long run), so we just signed it over to him a little earlier.
Since that time DS23 has gotten several other tickets for speeding and one for open container, which in GA goes down as DUI. Well, now the chickens have come home to roost because he's been trying to get a job. Several potential employers have turned him down due to his background check, even though he has no police record other than these traffic violations. His car insurance is through the roof and he has no other choice but pay it.

DS has also defauted on some medical bills and has consequently ruined his credit. The hardest thing for me as a mom is to stand by and let him learn these lessons.