If you have a hip replacement, knee replacement, a metal plate and screws, a metal rod inside your bone, or one of many other types of orthopedic implants, you may set off the airport metal detector.
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Procedure for security screeningAlthough metal implants can inconvenience these travelers by triggering the alarm and increasing time spent in security, this will not cause any additional harm to the person's body, according to the London Upper Limbs Surgery website.
If the person is carrying any metal objects, the metal will disrupt the magnetic field or the electromagnetic field. This disruption will cause a classic metal detector circuit to set off an alarm.
TSA uses millimeter wave advanced imaging technology and walk-through metal detectors to screen passengers. Millimeter wave advanced imaging technology safely screens passengers without physical contact for metallic and non-metallic threats, including weapons and explosives, which may be concealed under clothing.
Other things that accidentally set off body scanners are body piercings and wire supports in undergarments. External tumors might also trigger the machine, but growths inside—such as fibroids—will not. “Perspiration is probably the weirdest thing that can set off the scanners,” Malvini Redden says.