Yes, TSA PreCheck members must still go through security, but they utilize a dedicated, expedited lane designed to be less intrusive and significantly faster than the standard process. You are not "skipping" security; rather, you are undergoing a "trusted traveler" version of it. In the PreCheck lane, you generally do not have to remove your shoes, light jackets, or belts, and you can leave your laptop and 3-1-1 liquids inside your carry-on bag. However, you must still pass through a walk-through metal detector (and occasionally a body scanner) and your bags must still be X-rayed. TSA officers also reserve the right to perform random "enhanced" screenings, swabbing hands for explosives or conducting a manual bag search, even for PreCheck members. The program is a risk-based security measure, meaning that because you have already passed a federal background check and provided fingerprints, the TSA deems you a lower threat, allowing them to focus their more intensive resources on passengers who have not been pre-vetted.