The part of TSA screening that makes travelers most uncomfortable isn’t the bag X-ray — it’s the body scanner. Stepping into a tube with your hands over your head while an officer studies an image of you is a strange and intimate part of a public airport. Many travelers don’t know they can opt out. Many who do opt out don’t know what they’re agreeing to instead. And almost nobody reads the placard explaining what the machine actually sees.

Here is the complete guide to TSA body scanners, pat-downs, and what your options actually are at the checkpoint in 2026.

What the Body Scanner Actually Is

The machines TSA uses today are called Advanced Imaging Technology (AIT) units, manufactured primarily by L3Harris and Smiths Detection. They are millimeter-wave scanners — the kind that look like a glass tube you step into and raise your arms — not the older “backscatter” X-ray units, which TSA removed from airports in 2013 due to privacy and safety concerns.

Millimeter-wave technology uses low-power, non-ionizing radio waves — similar in frequency to your wifi router but lower energy. The scanner takes a 3D scan of your body’s surface in about 1.5 seconds, comparing the contour against a generic body outline (the same outline for everyone, regardless of who is being scanned). It is not a camera. It does not produce a photograph of you.

When the scan completes, the officer does not see your body. They see a generic stick-figure outline on a small screen. If the software detects something on the outline — a phone-shaped object in a pocket, a wallet bulge, a metal buckle — a yellow box appears on the figure showing where the anomaly is. If the scan is clean, a green “OK” appears. That is what the officer at the exit sees.

The image is not stored, not transmitted, and not viewable by humans. This has been independently audited and is enforced by the design of the system — there is no save-to-disk option in the operator interface.

What Triggers an Alarm

The scanner is sensitive. Anything on or near your body that doesn’t fit the standard human silhouette generates an alarm. Common triggers:

  • Phones, wallets, keys in pockets — even if you thought you emptied them
  • Belts, watches, jewelry — especially metal buckles
  • Underwire bras — frequent trigger for women; usually clears with a quick pat-down of the chest area
  • Hair clips, ponytail holders with metal, hair extensions — bun and braid alarms are common
  • Pockets, cargo shorts, hoodie pouches — anything that creates a void or bulge
  • Sweat or moisture — heavy perspiration on the back can read as an anomaly
  • Heavy clothing — winter coats, thick sweaters, layered shirts
  • Medical devices — pacemakers, insulin pumps, ostomy bags, prosthetics (declare these in advance)
  • Religious head coverings — often cleared with a self-pat-down or chemical swab

About 20-30% of passengers trigger a yellow-box alarm. The vast majority of those are entirely benign — a forgotten Chapstick, a thick waistband, a bra wire. When the scanner alarms, the officer at the exit performs a targeted check on the area indicated by the yellow box. They are not checking your whole body — just the specific zone the machine flagged.

For tips on what to wear to avoid scanner alarms, see our guide on what to wear through airport security.

How to Opt Out of the Body Scanner

You have a legal right to refuse the body scanner. To opt out, simply say to the officer at the front of the lane: “I’d like to opt out.” That’s it. You don’t need a medical reason, religious reason, or any reason at all.

What happens next:

  1. The officer will call out “opt-out” or “male assist” / “female assist” depending on your gender presentation.
  2. You will be asked to stand off to the side while a same-gender officer is called over.
  3. The officer will explain the pat-down procedure to you before they begin and tell you exactly what they will touch.
  4. You can request that the pat-down be conducted in private, in a closed screening room, with a witness present.
  5. You have the right to a witness of your choice — a travel companion, a family member, or another TSA officer.

The wait for a same-gender officer can be 2-15 minutes depending on the airport and time of day. Plan for this extra time if you intend to opt out — it can be the difference between making and missing a flight at a busy checkpoint.

Children under 12 are not required to go through the body scanner under any circumstance — they get a walk-through metal detector or a screening tailored to families.

What a TSA Pat-Down Actually Involves

A pat-down is a hand search of your body, conducted over your clothing, by a same-gender TSA officer. The officer uses the backs of their hands for sensitive areas (chest, groin, buttocks) and the palms for other areas (arms, legs, back, waistband). They are trained to be efficient and professional, and pat-downs at most US airports take 2-3 minutes.

The pat-down covers:

  • Head and hair — running hands through hair, around the head and neckline (especially for head coverings)
  • Torso — front, back, sides, including the chest and bra-line for women (back of hand)
  • Waistband and belt area — including under any belt buckle or waistband bulge
  • Buttocks and groin area — back of hand, with a single pass through the inseam
  • Legs — front and back, including inside the thigh and calves
  • Arms and shoulders — full pass
  • Feet — sometimes including a sock check if shoes are off

Pat-downs are described to you before they begin. You can stop the pat-down at any time, but stopping it before it concludes means you will not be allowed through security on that ticket. You can request a private screening at any point. You can request the officer’s name and ID.

Pat-downs are conducted in the open by default. They are not strip searches, not invasive cavity searches, and not “rough” — TSA officers are trained on a standard pat-down procedure that is the same nationwide.

Targeted Pat-Downs vs Full-Body Pat-Downs

There are two pat-down scenarios:

  1. Targeted pat-down: You went through the body scanner and a single area alarmed (waistband, chest, etc.). The officer pats down just that area. This is the most common pat-down and takes about 30 seconds.

  2. Full-body pat-down: You opted out of the scanner, refused additional screening, or triggered a more serious alert. Officer covers the full body as described above. Takes 2-3 minutes.

Most travelers experience a targeted pat-down at some point — a bra wire, a forgotten coin, a damp shirt. Full-body pat-downs from opt-outs are less common but follow the same procedure every time.

Special Situations

Medical Devices, Implants, and Pumps

If you have a pacemaker, insulin pump, ostomy bag, prosthetic limb, or other medical device, tell the officer before you enter the scanner. The officer will route you to an appropriate screening — often a pat-down that avoids the device area, or a chemical swab of the device for trace explosives. You can request the device be screened by a supervisor. For joint replacements, pacemakers, wheelchairs, and the modified screening rules that apply at age 75 and older, see our guide to TSA rules for seniors and travelers with limited mobility.

A doctor’s note is helpful but not required. The TSA Cares helpline (855-787-2227) can arrange a smoother screening if you call 72 hours in advance.

Religious and Cultural Head Coverings

Hijabs, turbans, sheitels, and other religious head coverings are not required to be removed at the checkpoint. The officer may ask you to self-pat the head covering, or may pat down the covering themselves (same-gender officer). If a more thorough check is needed, you can request that it be done in a private screening room.

Pregnancy

Body scanners are safe for pregnant passengers — the radio-wave energy is far below any biological threshold. Many pregnant travelers still prefer to opt out and request a pat-down. This is your right with no questions asked.

Children

Children under 12 don’t go through body scanners and get a modified screening. A parent can stay with the child throughout. See our flying with kids guide for more.

Service Animals

A service animal stays with the handler through screening. The handler goes through the metal detector or scanner; the dog walks alongside. A pat-down is performed if the dog or handler alarms. See our flying with pets guide for full procedures.

Your Rights at the Checkpoint

You have specific rights at TSA screening, even though TSA is a federal agency and not a court of law:

  • Right to opt out of the body scanner — always, without reason, on every flight.
  • Right to decline the face scan at the ID podium — see how to opt out of TSA facial recognition.
  • Right to a same-gender officer for pat-downs and intimate screenings.
  • Right to a private screening in a closed room, with or without a witness of your choice.
  • Right to a witness present during a private screening.
  • Right to know the officer’s name and ID — they are required to provide it on request.
  • Right to ask for a supervisor at any time.
  • Right to refuse screening — but you will not be allowed past security on that ticket, and you cannot leave the checkpoint area until cleared.
  • Right to medical accommodations — you do not have to disconnect a CPAP, insulin pump, or other essential medical device.

What you do not have:

  • A right to record or photograph the screening (TSA’s published policy is that photography is generally allowed in the screening area but officers can ask you to stop if it interferes with the screening — in practice, getting out a phone during your own pat-down will create friction).
  • A right to refuse a pat-down after opting out and still pass through. The scanner and the pat-down are the two options; you must accept one.
  • A right to leave the checkpoint freely once screening has begun. Walking away mid-screening can result in being detained and questioned.

For the questions this list does not settle, such as whether TSA can search your phone, check you for warrants, or stop you from filming, see our guide to what airport security can and cannot do.

How Often Are Pat-Downs Actually Random

Some pat-downs are not triggered by an alarm at all — they are random or targeted by other criteria. TSA does conduct random secondary screenings, including pat-downs, even on travelers who clear the scanner with no alarm. This is by design, to prevent passengers from learning the system. If you get a “random” pat-down, it is not because you did anything wrong — it is a routine TSA procedure.

PreCheck travelers are statistically much less likely to be selected for random pat-downs. If you fly more than a couple of times a year, see our guides on TSA PreCheck and PreCheck vs Global Entry for whether enrollment makes sense.

One pat-down is never random: if your boarding pass shows SSSS, a full pat-down is guaranteed, along with a hand search of every bag. Our SSSS secondary screening guide explains why you were selected and how to get through it faster.

How to Make Screening Faster

If you want to minimize your time at the checkpoint, the most useful steps:

  1. Empty pockets completely before entering the scanner — not into the X-ray bin at the last second, but at the back of the line. Walk in with nothing on you.
  2. Skip the belt if your pants stay up without it. Belt buckles trigger a high percentage of scanner alarms.
  3. Wear low-metal shoes. They stay on your feet in every lane now, so the goal is not setting off an alarm.
  4. Avoid metal jewelry beyond a watch. Hairpins, large earrings, and stacked bracelets all create issues.
  5. Skip the body scanner only if you have time — opt-out pat-downs add 5-15 minutes on average.
  6. Get PreCheck — PreCheck lanes don’t always use the body scanner. Many PreCheck lanes still use walk-through metal detectors, which clear faster.

For more, see our guide on 12 ways to get through TSA faster.

What If Something Goes Wrong

If you believe an officer behaved inappropriately, threatened you, touched you in a way outside the standard pat-down procedure, or refused you your stated rights:

  • Ask for a supervisor immediately at the checkpoint. They will pause the screening and review.
  • File a complaint with TSA: tsa.gov/contact-center or call 866-289-9673.
  • File a civil rights complaint if relevant: tsa.gov/civil-rights.
  • Get the officer’s name and ID — they must provide it.
  • Note the time, terminal, lane number, and supervisor’s name.

Most pat-downs are uneventful and professional. The TSA officers at major US airports conduct thousands of these per day. But if something goes wrong, you have channels to address it.

Frequently Asked Questions

Can I refuse a TSA body scanner?

Yes. You have the right to opt out and receive a pat-down by a same-gender officer instead, with no reason required.

What does the TSA body scanner show the officer?

Only a generic stick-figure outline — the same outline for every passenger — with a yellow box highlighting any area that flagged an anomaly. The officer does not see your actual body or a photo. The image is not stored.

Is the body scanner safe?

Yes. Modern TSA body scanners use millimeter-wave technology, which is non-ionizing radio frequency — similar to wifi, far below any biological threshold. The older backscatter X-ray scanners were removed in 2013.

What happens during a TSA pat-down?

A same-gender officer searches your body over your clothing, using the backs of the hands for sensitive areas and palms for other areas. The pat-down is described before it begins and takes 2-3 minutes for a full-body version, 30 seconds for a targeted version.

How do I ask for a private screening?

Tell the officer: “I’d like a private screening.” You’ll be taken to a closed room with a same-gender officer. You can have a witness present — a travel companion or another TSA officer.

Can children go through the body scanner?

Children under 12 are not required to go through body scanners. They get a modified screening with a parent present.

Will opting out make me miss my flight?

It can. Opt-out pat-downs add 5-15 minutes on average, and longer at busy times. If you intend to opt out, plan extra checkpoint time, and check your airport’s busiest hours so you aren’t opting out in the middle of the rush.

Do PreCheck members go through body scanners?

Sometimes. Many PreCheck lanes use walk-through metal detectors instead of body scanners, which clear faster and don’t require arms-over-head positioning. The exact equipment varies by airport and lane.

Can I refuse a pat-down after opting out?

No. The scanner and the pat-down are the two screening options. Refusing both means you will not be allowed through security on that ticket.

What if I have a medical device?

Declare it before you enter the scanner. The officer will route you to a screening that avoids interference with the device — usually a pat-down with the device swabbed for trace explosives. A doctor’s note is helpful but not required. Call TSA Cares (855-787-2227) 72 hours ahead for complex situations.

Before you head to the checkpoint, look up your airport on Airport TSA Times to see when its checkpoints are busiest, from TSA’s own hourly counts. If you plan to opt out of the body scanner, the extra 10-15 minutes for a pat-down means you’ll want a buffer, so avoid the peak hours if you can.

For more on faster screening, see our guides to TSA PreCheck, what to wear through security, and 12 ways to get through TSA faster.