A Delafield man in February repeatedly dumped his burnt marijuana ashes on some cardboard boxes, which ultimately caused them to ignite and burn his father's Summit home to the ground, according to a criminal complaint. As a result, Joseph Fischer has been charged with misdemeanor negligent handling of burning material. Fischer, 29, is scheduled to make his initial appearance in Waukesha County Circuit Court on June 11. The fire started just before 4:30 a.m. Feb. 22 in the 34000 block of Venice Park Road. According to the complaint, Fischer smoked three bowls of marijuana in the 90 minutes before the fire broke out, and each time dumped the ashes onto some cardboard boxes on the porch of his father's home.