Forensic scientists aren't always working a hot case. Sometimes they look into petty theft crimes, or even examine evidence in a civil suit. Sometimes they'll run 1,800 blood samples, only to hear about a plea bargain that was struck one day prior—essentially erasing a week's worth of work.
But when it does count, and when the crime gets solved, chances are you'll feel pretty good about yourself if you helped put the right person behind bars.
When things in the forensic science world go the right way, you can count on a great sense of accomplishment. You haven't just solved a mystery, you've played a part in restoring justice.