One final thought on these programs. Both TSA PreCheck and Global Entry are administered by government agencies. The agencies are well respected but you are providing them your personal data including fingerprints and a photo of your face. You have to weigh the trade-off of convenience ...
2) A set of absurd liquid rules exist, yet cannot actually stop a determined person from carrying the required liquids on-board, whether by splitting the liquid across multiple 3 oz containers or by getting their counterpart to share the load in bringing the liquids on-board. In fact, why ...