Facial recognition is quietly becoming a routine part of traveling in the U.S. If you’ve flown recently, you'll see cameras scanning your face at checkpoints or boarding gates. This is part of the Transportation Security Administration’s (TSA) use of facial recognition at airports. While TSA claims it's for “security,” advocates are sounding the alarm. Here’s why you should opt out asap and how.

Flying involves security protocols designed to ensure the safety of passengers and crew. One of the most critical aspects of these protocols is the restriction on certain items that can be carried onboard. Whether you're a frequent flyer or a first-time flyer, you need to be aware of these restrictions to avoid any hassles at the airport. Here are 8 things you definitely can't bring on a plane.