Originally Posted by
jsloan
The dogs sniff for explosives. As to the purpose it serves… pretty much the same purpose as the rest of the “security” operations.
Sometimes they seem to open the metal detectors instead of the body scanners (to quote: “pretty much the same purpose as the rest of the ‘security’ operations). An hour later, they might have swapped everything around.
+1 - since you passed the dog test, they can proceed with the metal detector instead of body scanner, as the metal detector test is faster.