Last week the state Department of Natural Resources suffered another, and perhaps final, setback in its attempt to successfully prosecute an alleged west-central Minnesota deer poacher. On Monday, the Minnesota Court of Appeals affirmed a lower court's decision that the surreptitious placement by DNR conservation officers of an electronic tracking device on a pickup owned by Joshua Dwight Liebl of Dawson, Minn., violated Liebl's protection against unreasonable search guaranteed by the U.S. and Minnesota constitutions.