If your training is not sufficient that you cannot tell the difference between an underwire bra and a handgun, then your agency is a bigger waste than I thought.
I would also like to know what you mean by this? Are you saying that just handwanding the person in the bra area should be enough to tell if there is a gun there or a underwire bra?
I know I never noticed anything different in regards on how the HHMD rings or acts when it's in the presence of a large metal source such as a weapon other then a sustained alarm from it. But you can get the same kind of alarm from a wallet with a metal coin in it.