The Genesee County Sheriff’s Office has set up checkpoints to search cars for drugs around the city of Flint, something that legal experts say is almost certain to be found unconstitutional by a federal court if challenged. The Detroit Free Press reports : At least seven times this month, including Tuesday, motorists have said they have seen a pickup towing a large sign on I-69 or U.S.-23 that depicts the sheriff’s badge and warns: “Sheriff narcotics check point, 1 mile ahead — drug dog in use.” The checkpoints are part of a broad sweep for drugs that Genesee County Sheriff Robert Pickell and his self-titled Sheriff’s Posse said are needed, calling Flint a crossroads of drug dealing because nearly a half-dozen major roads and expressways pass in and around the city. Pickell said he decided to try checkpoints when he learned that drug shipments might be passing through Flint in tractor-trailers with false compartments… Based on a case out of Indianapolis, the U.S.