Attention Moms and Dads out there wanting to keep up when your kids is doing donuts or racing down the interstate. Here's a possibility: Steer Straight: A service that for $99 bucks a year gets you stickers to put on the kid's car and when other drivers see them acting up, they call the number and the service email or text messages you.
Certainly an idea worth considering and doesn't sound too unreasonable cost-wise. They don't report your weaving kid to the cops. It's a matter between you and the kid. Worth considering. I'll bet your kids will love it; heck, on the other side of the bumper they might even add the old sticker of "Don't like my driving, call 1-800-eat-$$$$."
Seriously, I can't think of a reason why this wouldn't work, but I'm sure my kids could.