At least my screening escalation matrix doesn't put TSA's flawed Whole Body Imager as the first hurdle.

Until TSA develops the maturity to understand that alarms on non-threat items are false alarms the public will see little improvement in screening methods. The same comment can be applied equally to the ETD machines. I don't really expect front line screeners to understand these things but would expect senior TSA staffers to grasp this concept. But in my opinion TSA has been a major disappointment on every level so TSA's failures are no surprise.