After a yearlong investigation by conservation officers, four people in Linn and Buchanan counties have been convicted of dozens of wildlife violations.Jason Webster, 42, of Quasqueton and Jeremiah Pillard, 42, of Troy Mills, were charged with multiple offenses following a routine inspection of local taxidermy operations that led to authorities executing search warrants in January 2020, according to a news release from the Iowa Department of Natural Resources.