In reply to dunk:
australia can be.
they do have stuff they spray things like the soles of boots etc with, but no idea what it does to quickdraws.
theyll probably not worry about your rack but if it is filthy or youve come from an ebola plagued region maybe give it a wash. if they do look like theyre about to spray it tell them your concerns.
all said, i once got thru a pair of socks and my rock shoes that they should have destroyed but didnt even notice.