What form would I fill out to present to a judge to have a paraphernalia charge expunged from my record 7+ years ago?

My family saved empty stamp bags for 2 years and believe it or not I had stopped using that and began going to the methadone clinic when they took to our local cops and had me charged with paraphanalia charges. The magistrate and the cop (who I must add lives directly in front of my parents and my nephew and his son our best friends; cys swept under the rug or drug their feet not sure due to the fact that my nephew sexually mollested my daughter from age 5-6 until we moved from my mom's house at age 14-15.) I heard there was a form you could fill out and take in and present it to the judge to expunge the charge but I cannot find out. I am a full time student and am currently unemployed.