All of the discussion here is opinion but you alarmed the WTMD but passed the WTETD and back scatter (proved it was nails or shank) then why not. One test should clear or prove another. I guess it would all depend on how the lane was set up. My opinion would be to have the WTMD first, a person alarms they can be given a second chance to divest something they forgot. then WTETD for explosives and then back scatter to clear alarms from WTMD and WTETD. If the alarms could not be cleared then a wanding/pat down could be used.

Again, my opinion.