I don't think digital technology needs to apply here at all. Before there were phones, were authorities able to stop you and look through your personal papers

I don't think digital technology needs to apply here at all. Before there were phones, were authorities able to stop you and look through your personal papers or briefcase or other personal effects you were carrying, without probably cause or a warrant? I don't think. A phone isn't any different, it's just a lot smaller than a briefcase.