More than 2,500 motorists were pulled over and arrested for impaired driving last month in Minnesota. The crackdown came as the state marked its lowest number of yearly highway fatalities since World War Two. The Public Safety Department’s Nathan Bowie says the December total is up from a similar DWI crackdown in December of 2010. The offender with the highest blood-alcohol concentration last month registered .39%. One in seven drivers in Minnesota has a DWI on his or her record, and the latest figures show that most alcohol-related traffic deaths are in Greater Minnesota.