Inside every American airport there is a system of checkpoints where travelers are required to identify themselves with legal documentation before boarding an aircraft. Acceptable identification at these checkpoints includes a state issued drivers license or ID card, a valid passport, U.S. Military ID or a Department of Homeland Security "Trusted Traveler" card.AirSafe.com: Airport Security Issues

1. Preferred ID should be presented at screener checkpoints
2. Keep your photo ID handy
3. Only Travelers with a valid ticket and boarding pass are allowed beyond the screener checkpoints
4. Travelers are limited to one carry-on bag and one personal bagAirSafe.com: Airport Security Issues
5. Travelers should remove their shoes and all metal objects from their pockets prior to passing through the metal detectors
6. Electronic devices such as laptops and cellphones should be turned off at these checkpoints
7. Laptops will be X-rayed separately
8. Be aware of unattended packages or bags

The whole-body imaging machines are operated by two security professionals to ensure privacy, one professional operates the machine while the other screens the images in a separate room. The security professional operating the machine never sees the images and the security professional screening the images never sees the passenger. As additional privacy precautions, the passengers' faces are blurred out and the total image is "fuzzy". Each image is deleted automatically after being screened.

In May 2009, privacy advocate groups asked the TSA and the U.S. Department of Homeland Security to suspend the use of whole-body imaging machines. The TSA said that precautions have been taken to ensure passenger privacy.CNN: Airport security bares all, or does it? (May 18, 2009)