In the slow evolution of airport security, the TSA is contemplating a small but symbolically meaningful concession to its PreCheck members: the right to carry a full water bottle past the checkpoint, at airports equipped with CT scanning technology capable of reading a liquid's nature rather than simply banning it. The 3.4-ounce rule, born of post-9/11 anxiety and now two decades old, remains untouched for most travelers. What is being tested here is not just a policy adjustment, but a question about whether trust, technology, and tiered membership can gradually reshape the architecture of pub