I'm Doug, and I'm very sorry to hear of your son's situation. My goal is to provide you with excellent service today.
I presume that one or more of the DUI's was deemed a felony, as that is the only way that his gun rights would have been taken.
As you may not be aware, federal law generally makes it a felony for a person to be in possession of a firearm if the person has any prior felony conviction.
Though, there is an exception. That exception depends on whether you have had your civil rights restored. And whether you have had your civil rights restored for a state conviction is determined by state and NOT federal law.
Federal law requires that for the feds to recognize the state restoration of rights, the state restoration must include the right to vote, the right to seek and hold public office, and the right to serve on a jury. The restoration of your son's gun rights is accomplished by him applying to the court for, and being granted, an expungement of his felony conviction(s).
Once he has the expungement order and restoration of rights, he will also need to send a copy of the order to the FBI Gun Appeals unit to have them enter the order in their computer records as well. That way, he won’t be flagged and denied when he applies to purchase a firearm, or to sell them.
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I wish you and yours the best in 2016,