What is the law regarding expungement of misdemeanor charges?

Question Details: I am 30 years old and cannot get a job because of mistdemeanor possession and paraphernalia marijuana charges from when I was younger. One was under the age of 18 but it still shows on a back ground check. The most recent one I received was .5 gram of marijuana on me at the age of 21 because my car smelled like it even though it was from cigarettes. I haven't gotten a single charge or even a ticket since then but I am permanently damaged professionally because of mistakes I made when I was younger. It's 3 total charges, they either were thrown out, or dismissed. Nothing above 1gram and 1 small paraphernalia. I recently heard NC is allowing your record to be expunged or sealed. Is this possible for me?

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