Read a blogger post about the CAGE unit it goes something like this.
CAGE unit is targeting law-abiding citizens, not criminal gunrunners.Thanks to a ruling by a liberal federal judge, the CAGE unit now has the name of every single person in the United States who, since 1992, lawfully purchased more than one handgun in the period of a week. The CAGE unit also has all the makes, models and serial numbers of those guns. In essence, the Chicago Police Department is now registering guns and gun owners nationwide.