Minnesota Blood Alcohol Content: A Historical Overview
Since 1911, Minnesota law enforcement have cited drivers who operate a motor vehicle while under the influence of alcohol. It wasn't until 1955 that the Minneota Legislature codified a blood alcohol standard of .15, calling such a level "primae facie" evidence of intoxication. That level was dropped to .10 in 1967.
In 1971 the Legislature enacted statutes that made it a "per se" violation to operate a motor vehicle with a blood alcohol content of .10 or more. That standard was dropped to .08 in 2005, under pressure from the federal government. Minnesota was the last state in the nation to adopt the .08 standard.