So long story short, a friend of mine was pulled into an ATF investigation through no fault of his own. He bought a lower from somebody on Backpage several years ago and now that person is being investigated by ATF for something or other. ATF contacted my friend and wanted to interview him, and also apparently asked for the lower he had bought. He refused to cooperate, which was probably a mistake, and during a phone conversation the agent implied they could flag him in the Arizona MVD system and if he were stopped by the police and had firearms in his possession they could order them impounded. Do they have that capability??