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Police should not be able to search unless that have probable cause that it is being used as a weapon or in the commission of a crime. Like the article says:
Suspected bomber typing on a phone: The phone is a weapon
Bunch of drunks acting disorderly: No searching the phone
Granted, one these situations is an extreme and the other is a far more common occurrence. The default should be no search. Though, I would argue that this is a 3rd and 4th Amendment issue (not a 1st Amendment one). Privacy and Reasonable Search and Seizure respectively. I look forward to seeing an opinion on this.
Another issue that I would be worried about is the fact that so many phones have cameras and many people use them to record police action. I would be worried that police may confiscate phones to "search" to prevent themselves from being recorded. No matter how honest you are, no one is comfortable with someone being about to over analyze ever decision you made in a tense situation.