Post-conviction claim too late, high court says
Birchfield, Trahan and Thompson precedents control in implied-consent cases
Implied-consent law has been changing since the U.S. Supreme Court decided Birchfield v. North Dakota in 2016. That case decriminalized blood test refusal when police had no warrant.
In 2018, the Minnesota Supreme Court held that Birchfield announced a new rule that applied retroactively. That was parsed by subsequent …