Question

what does ex post facto law mean?
new laws can sometimes apply to people operating before the new law was passed
new laws always apply to people operating before the new law was passed
new laws cannot apply to people operating after the law has passed
new laws cannot apply to people operating before the new law was passed

Explanation:

An ex - post - facto law is a law that retroactively changes the legal consequences (or status) of actions committed or relationships that existed prior to the enactment of the law. So new laws can sometimes apply to people operating before the new law was passed.

Answer:

new laws can sometimes apply to people operating before the new law was passed