What kind of education do you need to become a crime scene investigator?

A degree in criminology is probably way up on the list, if not at the top. A minor in chemistry, physics, or biology would be extremely helpful and is probably necessary. Best way to find out, call a major city's police department (not 911 :) and ask around. If they have a CSI-type department, you should be able to find a spokesperson who could better answer your question.