It is true that even an updated and reauthorized law will not completely ensure public safety. No law can. That is not an excuse, however, for inaction. The emerging capacity for virtually anyone to produce guns that can evade detection poses a threat at airports and sensitive buildings, including the U.S. Capitol.
One promising focus of innovation is expanded chemical detection, which may enable more screening machines to sniff out gunpowder. Given the lack of realistic alternatives, that may be the best option technologically. Meanwhile, there is the Undetectable Weapons Act, which serves as both an assertion of principle and a deterrent to crime. Congress should reauthorize it promptly.