TSA works as the federally mandated agency that secures every domestic flight and commercial airport in the United States. Its mission is to prevent dangerous items from reaching the cabin while enabling millions of travelers to move through checkpoints efficiently each day.
By standardizing security rules and training for screeners, the agency coordinates with airlines, airports, and law enforcement to respond to evolving threats. This structure supports both rigorous inspections and predictable procedures for passengers.
| Function | What It Does | Impact on Travelers | Oversight |
|---|---|---|---|
| Checkpoint Screening | Scans carry-on bags and watches officers to detect prohibited items | Determines what passengers can bring through security | DHS and TSA Headquarters |
| Behavior Detection | Uses protocols to identify suspicious behavior at checkpoints | May lead to additional screening for some travelers | DHS and TSA Headquarters |
| Airfield Patrols | Secures perimeter fences, vehicle checkpoints, and sensitive areas | Minimizes unauthorized access to ramps and gates | Federal Air Marshals and Local Police |
| Incident Response | Coordinates responses to security threats, disruptions, and medical emergencies | Guides airport lockdowns, evacuations, or diversions | FAA and Airport Operators |
| Collaboration with Partners | Shares intelligence with airlines, airports, and other agencies | Improves overall safety and communication during incidents | National Counterterrorism Center |
Screening Procedures and Prohibited Items
What You Can and Cannot Bring
TSA establishes a clear set of rules for carry-on and checked bags, focusing on items that could be used as weapons or pose explosive risks. Travelers are told in advance about limits on liquids, sharp objects, and electronics.
Advanced Imaging Technology and Screening Equipment
How Backscatter and Millimeter Wave Scanners Work
Advanced Imaging Technology uses non‑intrusive scanners to detect potential threats without physical contact. Millimeter wave systems create generic outlines, while backscatter produces reflective images that are quickly discarded to protect privacy.
Checked Baggage and Cargo Screening
Explosive Trace Detection and Automated Protocols
Each checked bag passes through Explosive Trace Detection where swabs are tested for residues of explosives. Cargo holds additional layers of screening, including X‑ray and trace detection, to secure freight moving on commercial flights.
Airfield Operations and Access Control
Securing the Ramp, Gates, and Perimeter Fencing
On the airfield, TSA focuses on preventing unauthorized access to aircraft, gates, and sensitive infrastructure. Officers monitor vehicle checkpoints, verify credentials, and respond to anomalies that could affect flight safety.
Streamlined Travel Practices and Recommendations
- Pack liquids in clear, resealable bags to simplify inspections
- Wear slip‑on shoes and keep jackets in a bin to reduce screening time
- Keep electronics accessible and laptops in a dedicated sleeve
- Review the latest prohibited items list before each trip
- Arrive with extra time to manage unexpected additional screening
- Stay informed about changes to rules for international connections
- Use pre‑check or trusted traveler programs when you qualify
FAQ
Reader questions
Do I need to remove my laptop and liquids before reaching the checkpoint?
Yes, you must take out laptops and large electronics and place them in a separate bin. Liquids, aerosols, and gels must also be removed and fit within the allowed size and quantity limits.
Can TSA officers search my phone or require passwords?
Yes, officers can inspect electronic devices visually and may request passwords if selected for additional screening. You also have the right to decline a search, although this may result in denial of boarding.
What happens if an alarm goes off during my screening?
A triggered alarm typically leads to a brief follow‑up pat‑down or swab test to resolve the alert. This step helps confirm whether any residue or material on your belongings or clothing sets the equipment off.
How does TSA handle sensitive situations or accessibility needs?
Specialized officers are available to assist passengers with disabilities or medical devices, and private screening options can be offered when requested. Notify the officer at the checkpoint so appropriate accommodations can be arranged.