TSA Liquid Rules: When Will the 3-1-1 Rule Finally End?

For nearly two years, travelers have heard rumors that the days of cramming tiny shampoo bottles into a quart-sized bag are numbered. The Transportation Security Administration (TSA) is currently in the middle of a massive technology upgrade that promises to modernize airport security checkpoints. However, the rollout has been slower and more complicated than many anticipated. Here is the latest on the deployment of Computed Tomography (CT) scanners and what it actually means for your toiletry bag in 2024 and 2025.

Understanding the New Technology

The catalyst for ending the 3-1-1 rule (which limits liquids to 3.4 ounces or 100 milliliters) is the deployment of CT scanners. Unlike traditional 2D X-ray machines used for decades, these new units utilize technology similar to hospital CT scans.

The machines take hundreds of images to create a 3D rotatable view of the bag’s contents. TSA officers can manipulate this image on a screen to see underneath electronics and analyze liquid density without opening the luggage.

Because the machine can automatically detect explosives and prohibited items with high precision, the two main friction points of security checks become obsolete:

  • You do not need to remove laptops or tablets.
  • You do not need to remove liquids from your carry-on.

The Current Status in the United States

The TSA is investing heavily in this transition. In recent years, the agency awarded a contract worth up to $781.2 million to Analogic Corporation to supply these systems. Another contract was awarded to IDSS (Integrated Defense and Security Solutions). Despite this massive investment, the death of the 3-1-1 rule is happening in phases rather than all at once.

Phase 1: Keep It in the Bag (Happening Now)

If you fly through major hubs like Hartsfield-Jackson Atlanta (ATL), Detroit Metropolitan (DTW), or LaGuardia (LGA), you have likely already encountered these machines. They look different than the old grey boxes; they are usually white with a rounded, futuristic aesthetic.

At these specific lanes, TSOs (Transportation Security Officers) will instruct you to leave everything inside your bag. This speeds up the line significantly. However, the volume limit remains in effect. Even with the new scanners, the TSA still officially enforces the 3.4-ounce limit per container. The primary benefit right now is convenience, not capacity.

Phase 2: Lifting the Volume Limit (The Future)

The ultimate goal is to allow passengers to bring full-sized liquids (water bottles, full shampoo, wine) through security. This phase has not yet been greenlit for widespread implementation in the US. The TSA needs to ensure the false-alarm rate is low enough across thousands of machines before officially changing the federal regulation.

The UK Warning: A Case Study in Delays

To understand why the US is moving slowly, travelers should look at the United Kingdom. The UK government originally set a deadline of June 2024 for all major airports to install these scanners and scrap the 100ml liquid rule.

Several airports, including London City Airport (LCY) and Teesside International, successfully installed the tech and briefly scrapped the liquid limits, allowing passengers to carry up to two liters of liquid.

However, in June 2024, the UK Department for Transport (DfT) abruptly re-imposed the 100ml limit at all airports, even those with the new scanners. They cited the need for further improvements to the screening systems. While laptops and liquids can still stay inside the bags at these airports, the volume restriction is back in force. This technical hiccup serves as a major reason why the TSA is hesitant to announce a firm “end date” for the 3-1-1 rule.

Which Airports Have the New Scanners?

The rollout is inconsistent. You might find a CT scanner at one checkpoint terminal but an old X-ray machine at another terminal in the same airport. Currently, significant deployments of CT technology are active at:

  • Atlanta (ATL): Domestic South and International checkpoints.
  • Detroit (DTW): Widely deployed.
  • Chicago O’Hare (ORD): Select checkpoints.
  • New York (LGA & JFK): Present in newer terminals (like LGA Terminal B).
  • Los Angeles (LAX): Select lanes.

TSA Administrator David Pekoske has stated that full implementation across the entire US system will take several years. The agency must replace roughly 2,000 to 4,000 antiquated X-ray lanes.

Strategic Packing for the Transition Period

Because you cannot predict which machine you will get until you are standing in line, you must pack conservatively.

  1. Assume the 3-1-1 Rule Applies: Always pack liquids in containers of 3.4 ounces or less. If you pack a full-sized bottle and end up in a lane with an old X-ray machine, it will be confiscated.
  2. Listen to the Officer: If you are in a CT lane, the officer will shout “Leave everything in the bag.” Do not take your liquids out out of habit; this actually slows down the process for the new machines.
  3. TSA PreCheck is Still Faster: While the new machines make standard lanes faster, PreCheck lanes often utilize this technology combined with lighter screening protocols (shoes stay on), maintaining it as the fastest option.

Why Is the Rollout Taking So Long?

Beyond the technology hiccups seen in Europe, there are physical constraints. The new CT scanners are significantly heavier and larger than the old X-ray machines.

  • Floor Reinforcement: Some older airport terminals need structural reinforcement to support the weight of the CT gantries.
  • Power Requirements: The new machines consume much more electricity, requiring electrical grid upgrades at checkpoints.
  • Size Constraints: In tight checkpoints, the new machines simply do not fit, requiring airport authorities to redesign the queuing area.

Frequently Asked Questions

Can I bring a full water bottle through if I see the new white scanner? No. Unless explicitly told otherwise by the TSA (which is currently rare to non-existent in the US), you must stick to the 3.4-ounce limit. The machine can scan larger liquids, but the policy has not officially changed.

Does TSA PreCheck use these new scanners? Yes. Many PreCheck lanes are being upgraded with Analogic CT scanners. This enhances the speed of PreCheck since the machine processes the bag faster and with fewer false alarms.

When will the 3-1-1 rule officially end? There is no confirmed date. While the technology to end the rule is being installed, the regulatory change will likely not happen until a critical mass of airports (perhaps 80% or more) have the technology. Realistically, travelers should expect the 3-1-1 rule to remain in place through 2025.

Do these scanners damage film? Yes. CT scanners are much more powerful than standard X-ray machines and will ruin unprocessed film. You should always request a hand inspection for any film you are carrying.