Nolo's Plain-English Law Dictionary

Legal Dictionary Home

Need Professional Help? Talk to a Lawyer

Enter Your Zip Code to Connect with a Lawyer Serving Your Area

searchbox small
Ex Post Facto
Latin for "after the fact." Refers to laws adopted after an act is committed, making it illegal retroactively. Or, it can refer to laws that increase the penalty for a crime after it is committed. Such laws are specifically prohibited by the U.S. Constitution, Article I, Section 9.
LA-NOLO2:DRU.1.6.3.20141021.28794