In the United States, TSA policy generally allows passengers to take photographs or video at checkpoints as long as it does not interfere with the screening process or the staff's ability to do their jobs. You are permitted to film the equipment and the officers themselves; however, you are strictly prohibited from filming monitor screens showing X-ray images or other sensitive security information. While legal, filming can often lead to increased scrutiny or requests from staff to stop if they believe you are causing a distraction. In international airports, laws vary wildly. Many countries, particularly in Europe and the Middle East, have strict laws against filming police or security infrastructure, which can lead to the confiscation of your device or even arrest. Always look for signage; if a "No Photography" sign is posted, it applies to staff, equipment, and the general sterile area, and ignoring it can result in being denied boarding or legal penalties.