Congress renews undetectable gun ban just in time – Congress’ easy renewal of an expiring ban on undetectable plastic guns belies the larger reality that one year after the horrific school shooting in Newtown, Conn., major new firearms restrictions have little chance of enactment anytime soon. Lawmakers took an easy step Monday when the Democratic-run Senate unanimously gave final congressional approval to a bill adding another decade to the prohibition against guns that can slip by airport metal detectors and X-ray machines. The National Rifle Association, which has helped scuttle firearms restrictions this year, did not oppose the extension.