MIAMI — Investigators do not need a search warrant to obtain cellphone tower location records in criminal prosecutions, a federal appeals court ruled Tuesday in a closely watched case involving the rules for changing technology.The Atlanta-based 11th U.S. Circuit Court of Appeals, overturning a three-judge panel of the same court, concluded that authorities properly got 67 days’ worth of records from MetroPCS for Miami robbery suspect Quartavious Davis using a court order with a lower burden of proof.In its 9-2 …