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"SDOO" stands for self-directed (positional) opt out. This refers to the act of positioning oneself nearest the metal detector at an [airport security] checkpoint so that one can avoid screening by an AIT machine (either X-ray body scanner or MMW body scanner). It doesn't always work. There are THREE possible scenarios which can ruin a good attempt at a SDOO: 1) TSA "smurfs" block the WTMD with some type of object or themselves, 2) a TSA "moat dragon" demands you go through the AIT, or 3) both scenarios #1 and #2 occur simultaneously. The term "SDOO" is commonly encountered on [frequent flyer] forums, such as Flyertalk, where travelers discuss options for avoiding [unnecessary] radiation exposure or aggressive pat-downs at security checkpoints.
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