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Granted I'm only crossing one or two nights in a row once or twice a month, but last November I got sent to the back room. I have a valid passport with plenty of time left on it, so that wasn't it, I...

HK now has a metal detector at the alley entrance, as well as 2 in the main entrance. Tropical has a detector as well, and Adelitas is just using a wand.

It's not well defined but you can walk past everyone and show your Global Entry card at the first checkpoint, then go through the right door into the building and you'll see the Sentri line.