Can you work as a security guard with a misdemeanor on your record?

it depends on what your misdemeanor is and what your position requires. Theft for a job to handle money, you're out of luck. Regular security where you may need a gun and may drive. With a non-violent, non-theft misdemeanor; just say you were young and dumb. In reality, shell out 200-300 to get an expungement. The money you save in the long run will let it pay for itself.