How to stop all those law-abiding terrorists

3D printers are a challenge to gun control efforts, but sometimes they make politicians sound even more absurd than normal. Shockingly, this particular individual - Rep. Jim Langevin (D-R.I.) is actually a member of the US House of Representative's Gun Violence Prevention Task Force. He wants to renew the Undetectable Firearms Act. Here's what it covers:

Passed in 1988, the law prohibits manufacturing or possessing a gun that can’t be detected by airport security scanners. The law expires at the end of the year. Israel also wants to update it to include plastic ammunition magazines.

As terrorists seems likely to be willing both to manufacture and possess undetectable guns and 3D printing seems to enable them to do that manufacture (and hence enables them to possess), this law seems to make about as much sense as a law requiring potential hijackers to state their intentions to security screeners before boarding a plane.