"The German government just finished a 10-month test of millimeter-wave body scanners made by L3 Communications. It appears they are not happy with the results. The devices raise false alarms 7 times out of 10, and are confused by layered clothing, boots, zippers, pleats, and even incorrect posture. Australia recently started a trial, and the second person in at the Sydney airport set off the alarm repeatedly due to sweaty armpits."