HEMPSTEAD - Pay up or watch out: Nassau County is cracking down on scofflaws who have unpaid traffic and parking violations. A new audit reveals the county is owed about $70 million in unpaid fines, plus an additional $10 million in unpaid red light camera tickets. To recoup those funds, the county says drivers who don't pay up will have their cars booted and towed. Beginning in early March, a private company will drive across Nassau County, scanning license plates on public property. Any car with three or more unpaid tickets will get a boot, and booted drivers who still don't pay will have their cars towed, county officials say. The Nassau comptroller says the program won't cost the county at all. The county says it's aiming to recoup about half of that $80 million.