From Cornell University Legal Information Institute (with links to ruling)
From XIPHOS June 2014 Bulletin: Warrant Necessary to Search Cell Phones
From FLETC June 2014 INFORMER: This topic starts at the bottom of page 7.
From PoliceOne: Three Things Cops Need to Know About the Ruling on Cell Phone Searches
From IACP Blog: Supreme Court Limits LE Ability to Search Arrestee Cell Phones
See Case Law Warnings and Links Here