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.

The Transportation Security Administration (TSA) screens passengers and their belongings for prohibited items that pose a threat to aviation security, including explosives, incendiaries, firearms, and other dangerous weapons. In 2026, the screening process also focuses heavily on identity verification; as of May 7, 2025, a REAL ID-compliant license or a valid passport is required for all adult travelers on domestic flights. Using advanced CT scanners and X-ray technology, TSA officers look for dense electronics, suspicious powders, and liquids that exceed the 3-1-1 rule (3.4 ounces or less in a quart-sized bag). They also utilize "Aviation Security Officers" and canine teams to detect chemical signatures of explosives. Recent updates have streamlined the process for TSA PreCheck members, who can often leave shoes and light jackets on. The ultimate goal of the screening is to intercept any item—whether metallic, chemical, or organic—that could be used to cause harm or compromise the safety of the aircraft and its passengers.