I love my PreCheck and intend to upgrade it to Global Entry soon. I have never had any issues with it other than the lines being long because there are too many people in them who are not in the program. I agree with those who say that they need to eliminate the "random" people who have not paid for the service. It's like letting someone sit in first class just because coach is too crowded. If you want the benefits of the program, follow the process and pay for it. If the regular lines are too crowded then TSA needs to hire more people, not send some into a line that is supposed to be for those who have gone through the screening process.
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