Airport screeners working for the “badly” run Transportation Security Administration (TSA) reportedly failed to detect weapons more than 70 percent of the time in undercover tests — but that massive failure rate is actually an improvement from a similar test two years ago. Undercover investigators were able to smuggle mock knives, guns and explosives through airport checkpoints earlier this year, and succeeded far more often than they failed. But at least airport security is improving— slightly. When investigators did the same thing two years earlier, TSA equipment and personnel failed 95 percent of the time, prompting major changes in the...