Law enforcement agents violated the Fourth Amendment when they failed to get a search warrant before obtaining information from a cellphone service provider that placed a suspect in the vicinity of four robberies, a federal appeals court held.But the 7th U.S. Circuit Court of Appeals last week declined to throw out Eric Curtis’ conviction on eight counts stemming from the robberies.Citing Carpenter v. United States, 138 S. Ct. 2206 (2018), a 7th Circuit panel conceded the U.S. Supreme Court in June ruled in an …