Originally Posted by PTravel

Administrative searches by customs are not mandatory -- I've entered the U.S. from international trips many, many times and was never subject to a personal search and only twice subject to a search of my property. Upon presenting valid proof of citizenship, i.e. my passport, I must be admitted, i.e. I cannot be denied entry to the United States. That, by the way, is statutory (or, at least, a CFR -- it's been a while since I looked this up).

Regardless, not only is there no legal basis for a security search as a condition of admission, such a search is presumptively unconstitutional and expressly contradicted by the statute (or CFR), which defines the legal requirement for admission.