[Quote:]

Airport security lines can annoy passengers, but there is no evidence that they make flying any safer, U.S. researchers reported on Thursday.

A team at the Harvard School of Public Health could not find any studies showing whether the time-consuming process of X-raying carry-on luggage prevents hijackings or attacks.

They also found no evidence to suggest that making passengers take off their shoes and confiscating small items prevented any incidents.

The U.S. Transportation Security Administration told research teams requesting information their need for quick new security measures trumped the usefulness of evaluating them, Eleni Linos, Elizabeth Linos, and Graham Colditz reported in the British Medical Journal.

“We noticed that new airport screening protocols were implemented immediately after news reports of terror threats,” they wrote.

So there you have it – it really is just theater.