Originally Posted by studentff

Incorrect in a subtle but significant way. As written, it suggests that repeating the ETD test and getting a negative will prevent the rpd. As implemented, once they get *any* positive ETD after touching your body/stuff, they insist on performing an rpd, even if they believe the machine is broken.

I think there's even more to it than that. During the extensive bag search after my rpd at PDX, I started trying to root cause the source of the original alarm, and the STSO agreed to ETD a bar of hotel soap in my rollaboard at my request. Before doing so, he *loudly* announced to the other TSOs in the room that this test did not "count." Presumably, if it had "counted" and been "positive," something even more offensive would have happened to me or my stuff. As it was, the test was negative.