A Hartland bus driver originally charged with 28 felonies pleaded no contest to 4 misdemeanor charges in a Waukesha County courtroom, receiving a sentence of time served and one year of probation. Walter Cunningham, a former substitute bus driver, faced charges that included putting children's lives at risk. Those felony charges were dropped as part of a plea deal. The four misdemeanor charges included OWI.His attoney says the lab results showed…