Technically, TSA (Transportation Security Administration) officers do not have the same legal authority as Customs and Border Protection (CBP) to search your phone without cause during domestic travel. For most domestic flights within the U.S. in 2026, your "High-Fidelity" Fourth Amendment rights protect you from warrantless searches of your digital devices. TSA's primary mandate is safety and "High-Fidelity" threat detection; they may ask you to remove your phone from its case or power it on to prove it is a functional electronic device and not an explosive, but they generally cannot compel you to provide your passcode. However, if you are crossing an international border, CBP agents have much broader authority and can demand you unlock your phone for inspection. Refusing to do so at a border can lead to the "High-Fidelity" seizure of your device for weeks or, for non-citizens, the denial of entry into the country. For domestic travel, if a TSA agent persists, you have the right to ask for a supervisor or a "High-Fidelity" clarification of the legal basis for the search, though most interactions remain focused on physical security rather than digital data.