Not exactly the fondest sources, but the Daily Mail and a few other sites are saying the police will be looking into these cases.
I suppose they may be let off the hook for the drink driving (non-government grade equipment being used and not in a manner which is used by the police to conduct a DUI test) and the speeding (again, proably non-standardised equipment) or just be given a warning for those. The things like running red lights and acting like prats could probably be used as evidence though.
I did watch one of the episodes as a point of reference, and they just simply should not be on the roads. Giving someone a car for "only breaking the law a few times less than before" is absolutely idiotic and they should not be behind the wheel. Absolutely nobody in that programme (not the ex-policewoman, the parents, the friends, the producers nor the drivers themselves) show any real consideration for what these people are doing. Nobody cares just how terrible these people are at driving - It's mostly luck that nobody was really injured.
Believe me, I really dislike suggesting anything that may require the monitoring of people... But screw these guys. Give them points, or arrest them. With youth insurance rates so high, and people waving their arms around basically shouting "yeah, I'm the reason why!", I wouldn't feel sorry for them facing massive penalties for it. It's certainly not just young people to blame, but it is the young people who feel the effects of the insurance the most. Stick a black box in a speeder's car or enforce curfews for those who have been convicted of being irresponsible whilst carrying many passengers.
Yeah, I do hate to think that it would ever come to that, but these people are idiots. There is no excuse (television and entertainment is certainly not one) and those who are proven to be a hazard should be facing penalties. It's too easy to get away with being a bad driver - Just pay a fine and then carry on until you're caught the next time. It's sad.