A trio of Wisconsin attorneys, including two whose appearance in the first season of “Making a Murderer” launched them to international stardom, have started a nonprofit aimed at improving forensic science. Dean Strang and Jerry Buting, whose representation of Steven Avery in his homicide case for the murder of Teresa Halbach was featured in the Netflix docuseries, teamed up with Keith A. Findley, a University of Wisconsin Law School associate professor and co-founder of the Wisconsin Innocence Project.