When a Person Commits a Crime, Is There Probable Cause to Search the Person’s Phone for Evidence?

The question in the title of this post is one that I’ve been asked lots of times in different factual contexts. The basic question is, given that most people have cell phones, and that people tend to use their phones to document and to communicate about just about everything that they do, is it reasonable to believe that a person who has committed a crime has evidence of that crime on his or her phone?

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