Hayne and West had been using “junk science” to take advantage of “bad forensics, structural racism and institutional failures,” Duke Law wrote, from the 1990s through the 2000s. Duncan was the last person “awaiting an execution” based on Hayne and West’s testimony, according to ProPublica. Junk science can include bite marks, microscopic hair comparisons and bloodstain patterns, according to the Death Penalty Information Center. “Science deserves its privileged place in the courtroom, but only when it is truly scientific,” Hutchinson, Bowling and Mull wrote. “The most important safeguard against junk science is not a better jury instruction or a stronger cross-examination.