>I can't imagine TSA agents always remember to explain exactly what is going to happen.

Flight attendants are required by law to run through a pre flight safety instructional for every flight - even though we have all heard it many times. Police officers are required to read you your miranda rights.

TSA agents should be very well versed in all options afforded passengers under the law and be very well capable of relaying that information to any passenger without being prompted.

If the flying public is expected to be treated like terrorists you better believe I expect TSA agents to know exactly what they are doing.