At approximately 1:00 a.m. on June 20, 2011, Hennepin County Sheriff’s Deputy Barbara Russeth stopped Wall for a traffic violation. Upon her exiting the vehicle, Wall smelled of alcohol, exhibited poor balance, failed multiple field sobriety tests, and in a preliminary breath test, she produced a blood-alcohol concentration (BAC) of .109—beyond the .08 legal threshold, see Minn. Stat. § 169A.20, subd.1(5). Based on these results, Deputy Russeth arrested Wall and arranged for her car to be towed.
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