Research & Education JFS Articles AAFS Connect Conference Proceedings Reference Series Library International Educational Outreach Program False Negatives and Decreased Sensitivity of Heme Tests on a Leather Substrate: Incidence and Causes Presenting section: Criminalistics 2013 Krotulski, Alex J., Willow Grove PA; Osawa, Kei A., Dallas TX; Duggar, Anna S., New Orleans LA View the paper Criminalistics