3 years ago during thanksgiving i was flying back home. i was at the screening place and they stopped me. i had a knife in my backpack. i completely forgot i had it in there. i thought i took it out a while ago. anyway, i got a misdemeanor and had to do 120 hours of community service. i got the misdemeanor under penal code 171.5(b). is there a way i can get this off my record?