You need a warrent to search someone's property, but in a goverment owned facility or places that involve security, they don't need a warrent.
So basically meaning: So long as they had good reason to suspect somthing that would require a strip search, it's legal. If it bothers you that much though, there's always the method of patting your hands against the body for anything hidden, but if they did that then you'd just have claims that she was molested.
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