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Were you convicted of state or federal charges?
Unfortunately, you really have no recourse. Federal law prohibits a felon from being in possession of a firearm for any reason. For the federal charge, you'd have to receive a presidential pardon....with your other state drug cases, a presidential pardon is simply not in the cards. Even if you did obtain one, you would still have to seek the expungement of the state cases. Not all states allow for it and those that do usually do not do it when the person has multiple convictions.
I know that this isn't the answer that you were looking for. However, I hope that you find this information to be helpful in better understanding where you stand and why. I also hope that you find this answer to be ACCEPTable!
The application for a federal pardon can be found here: http://www.justice.gov/pardon/pardon_petition.htm
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