I believe its through human resources, you take a one time test and its a few hundred buck's and your certified to work customs forever. My boss worked/s custom's. You have a complaint you best keep it to yourself. When they hear flak they just tear through things since they have the RIGHT to do whatever they please in their "Discretion" haha. So basically good luck tracking that gun down brother!!! Keep your fingers crossed and ear to the ground.
Peace!
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