Good thing the terrorists have not thought of loading up a bra with explosives! Most would not crossdress anyway, even if the last thing they do! The airports would be making women take off bras or not allow bras to be worn on flights!
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I have had no problems wearing a bra through TSA security. Note that many "underwire" bras do not have actual metal "wire" but instead use a plastic or some other material for the "underwire".