Negligence in general isn't a crime - it does become a crime if gross negligence directly causes death or major injury, but as far as I know, you can't prosecute someone if their negligence merely costs someone some amount of money, no matter how much. It may cause liability for that amount of money, but that's not a crime that the government can prosecute and threaten with jail time, that's a civil case between them and whoever suffered and may sue them for some money.