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Transportation Security Administration

What are the procedures if I have an internal or external medical device, such as a pacemaker or metal implant?

Advanced imaging technology can facilitate your screening and reduces the likelihood of a pat-down. Inform the TSA officer that you have an artificial knee, hip, other metal implant or a pacemaker, defibrillator or other internal medical device. You should not be screened by a walk-through metal detector if you have an internal medical device such as a pacemaker. Consult with your physician prior to flying.

If you choose to not be screened through the advanced imaging technology or you alarm the walk-through metal detector, you will undergo a pat-down screening.