SAN FRANCISCO January 3, 2011 1:59pm
If you're arrested in California, even for a traffic stop, police can rifle through the old text messages, photos, video and voice mail on your cell phone without a warrant, the state Supreme Court says.
It contends that a U.S. Supreme Court decision can be interpreted that there's no violation of the Fourth Amendment if police comb through text messages without a warrant, if they've lawfully arrested you.
http://www.centralvalleybusinesstimes.com/stories/001/?ID=17272
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Also:
"Court OKs searches of cell phones without warrant"
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2011/01/03/BA5N1H3G12.DTL#ixzz1A1ihqfQi