My question involves a driver's license issued by the State of: Rhode Island

I've been charged with failure to obey traffic devices. Last year on may 27th 2010 the Colin B. Foote Act was passed. In short terms this act states that if i have four moving violations within an 18 month period of time my license may be revoked up to 1 or 2 years on top of driver retraining and community service.

If anyone wishes to review the statue here is the URL : http://www.rilin.state.ri.us/billtex...10/s2946aa.pdf

Since May 27th, 2010 I've only had two moving violations. all violations i've had prior to that date have been heard and paid in full. However the courts are still trying to apply the Colin B. Foote act to me. is it constitutional or legal for them to "backtrack" my driving record and violations from BEFORE the law was passed and apply them to the act?
Does this violate my fifth amendment right regarding double jeopardy? and even if not is it legal to "backtrack" like that?


Immediate responses greatly appreciated.