TSA Full-Body Scanners Trigger Pat-Downs for Feminine Hygiene Products in 2026

Navigating airport security remains a volatile experience for many travelers, where routine screenings can abruptly shift into invasive procedures. Recent reports indicate that Advanced Imaging Technology (AIT) scanners used by the Transportation Security Administration (TSA) are frequently flagging feminine hygiene products, resulting in mandatory pat-downs for female passengers.

The issue centers on how millimeter-wave machines interpret specific materials and moisture, often mistaking everyday menstrual products for potential threats or "clutter" in the imaging.

The Mechanics of the "False Alarm"

A passenger shared her experience on July 12 via the r/TwoXChromosomes subreddit, detailing how she was immediately pulled aside after passing through a scanner. The Transportation Security Officer (TSO) identified the crotch area as the point of concern, necessitating a physical pat-down.

During the interaction, the passenger identified her disposable period underwear as the likely cause. The TSO confirmed that several types of feminine hygiene products can trigger these alerts:

• Disposable Period Underwear: The specific material construction can appear as an anomaly on the scanner.
• Menstrual Pads: The extra absorbent material creates a density that the scanner flags.
• Non-Disposable Underwear: Moisture retention in fabric can trigger the sensors.
• Tampons and Pantyliners: Other travelers reported similar flags while using these products.

Why Technology Misinterprets Menstrual Products

The scanners in question are millimeter-wave machines that use electromagnetic waves to penetrate clothing and reflect off the skin or objects. According to Doug McMakin, the lead researcher who developed the scanner at the Pacific Northwest National Laboratory, these machines are prone to "clutter issues."

The technology can struggle to differentiate between a dangerous object and non-threatening materials that create a barrier or hold moisture. This is similar to how sweat has been known to trigger false alarms, as the machine may mistake perspiration for a foreign object.

Strategies to Minimize Screening Disruptions

While there is no guaranteed way to bypass a scanner's sensitivity, some travelers and industry insiders have suggested methods to reduce the likelihood of a pat-down.

A survey by Flex, a sustainable menstrual product company, revealed that 90% of respondents were unaware that period products could trigger security alarms. The company noted that menstrual cups are generally "totally fine" and unlikely to cause false alarms.

For those using pads or period underwear, the following practical steps may help:

• Adjust Stance: One traveler suggested standing with legs slightly further apart than the ground markings and squatting slightly to ensure no material is "squished together" between the thighs.
• Clothing Choices: Opt for breathable fabrics and avoid bulky layers or clothing that bunches around the waist and thighs.
• Temperature Control: If traveling in hot climates, take a moment to cool down before screening to prevent sweat from adding to the "clutter" flagged by the machine.
• PreCheck Utilization: TSA PreCheck often allows passengers to use metal detectors instead of full-body AIT scanners, potentially avoiding this specific issue.

Summary of Scanner Triggers and Solutions

Trigger Category	Specific Item/Cause	Why it Happens	Suggested Alternative/Fix
Absorbent Material	Pads, Period Underwear	Material density/thickness	Menstrual cups
Moisture	Sweat, Reusable Underwear	Electromagnetic reflection	Cool down before screening
Clothing	Bulky layers, Tight Spanx	"Clutter" in the imaging	Breathable, loose-fitting clothes
Positioning	Bunched fabric/thighs	Compressed materials	Wider stance during scan

Key Takeaways

• AIT Sensitivity: Millimeter-wave scanners often flag the density of pads and the moisture in period underwear.
• Common Triggers: Pantyliners, tampons, and even certain shapewear (like Spanx) have been reported as triggers.
• The "Cup" Advantage: Menstrual cups are cited as a low-risk alternative for avoiding scanner flags.
• Procedural Rights: Passengers can request that pat-downs be conducted in a private room if they are uncomfortable with the public checkpoint setting.

Travelers are encouraged to remain aware of their rights during security screenings to ensure a dignified transit experience.

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