What part of this Supreme Law do they not understand? "The right of the people to be secure in their persons, houses, papers[data], and effects[cellphones], 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 [phones] to be seized." It was adopted as a response to the abuse of the British Writ of Assistance, which is a type of general search warrant, during the 1760s and 70s and their use forbidden in 1776 when the Colonies declared themselves independent States.
Cellphones should not be searchable until a police officer stands before a judge and obtains a warrant, and swears an oath that he, the officer, is telling the truth (and punishable with Perjury if not).
–ASIMOV'S EDITORIAL – The Price (and profit) of Free Products http://www.asimovs.com/_issue_1002/onthenet.shtml

tools and techniques for mobile phone policy enforcement in organisations