Just say no.
Like this "Do you have a search warrant officer? No?
Oh. In that case you do not have permission to search my car".

If they do it anyway which they no doubt will then sue them. Sue them for everything they have and then some. I'm never out that way but people need to make a huge stink about this imo. It's against the law. panic

Motorists driving on expressways around Flint are getting surprised by a stunning tactic that the Genesee County sheriff has been using to fight the flow of illegal drugs -- one that legal experts said will not withstand a court challenge.

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.

"We're doing everything by the book," Genesee County Undersheriff Christopher Swanson said. "We think there's major loads (of drugs) coming through here from all over, every day. And this is one of the tools we use -- narcotics checkpoints."

He said the dogs are used to sniff around the vehicles to check for drugs.

The practice has legal experts on searches and seizures at two law schools in Michigan, a constitutional law expert in Lansing and the American Civil Liberties Union calling the practice out of bounds and out of touch with state and U.S. Supreme Court rulings that ban such practices.

Based on a case out of Indianapolis, the U.S. Supreme Court held in 2000 that narcotics checkpoints where everyone gets stopped on a public road are not legal and violate Fourth Amendment protections against illegal searches and seizures, professor David Moran at the University of Michigan Law School said....

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"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.