Ever heard of ex post facto, I reiterate??
ex post facto
United States
In the United States, ex post facto laws are prohibited in federal law by Article I, section 9 of the U.S. Constitution and in state law by section 10. Over the years, when deciding ex post facto cases, the United States Supreme Court has referred repeatedly to its ruling in the Calder v. Bull case of 1798, in which Justice Chase established four categories of unconstitutional ex post facto laws. The case dealt with Article I, section 10, since it dealt with a Connecticut state law.
However, not all laws with ex post facto effects have been found to be unconstitutional. One current U.S. law that has an ex post facto effect is the Adam Walsh Child Protection and Safety Act of 2006. This law, which imposes new registration requirements on convicted sex offenders, gives the U.S. Attorney General the authority to apply the law retroactively.[1] The U.S. Supreme Court ruled in Smith v. Doe (2003) that forcing sex offenders to register their whereabouts at regular intervals and the posting of personal information about them on the Internet does not violate the constitutional prohibition against ex post facto laws, because compulsory registration of offenders who completed their sentences before new laws requiring compliance went into effect does not constitute a punishment.[2]
Another example is the so-called Lautenburg law where firearms prohibitions were imposed on those convicted of misdemeanor domestic violence offenses and subjects of restraining orders (which do not require a criminal conviction). These individuals can now be sentenced to up to 10 years in a federal prison for possession of a firearm, regardless of whether or not the weapon was legally possessed at the time the law was passed. Among those that it is claimed the law has affected is a father who was convicted of a misdemeanor of child abuse despite claims that he had only spanked his child, since anyone convicted of child abuse now faces a lifetime firearms prohibition. The law has been legally upheld because it is considered regulatory, not punitive - it is a status offense.