It’s right there in the Fourth Amendment to the Constitution:
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Amendment IV
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
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Do not pass go, do not collect two hundred dollars, do not parse, do not fold, mutilate, spindle, tear, gut, burn or shred.
In keeping with policies and procedures consistent with gutting the foundational principles of our Constitution and democracy, the Bush Administration’s Department of Homeland Security has proceeded to ignore the care and handling advice and has engaged in the very actions verboten by those instructions.