>> reporter: quote, changing all metal detector settings to the tsa precheck setting. to normalize the passenger experience. brainard says the practice continues today. >> you could have a 30-minute wait time and they treat it like it's a national emergency. it is such an unhealthy obsession of placing speed over security. >> reporter: brainard says that obsession also led the tsa to disable technology on x-ray machines that screen carryon bags in precheck lanes. this internal memo states as of last month, those x-ray machines should be operated without the autodetection algorithm enables. >> a box will come around and surround the item and say stop and take a look at this. that box is no longer on the screen. tsa has made changes to the settings which really hamper the ability of the operator to detect explosives in the bag.