Among the areas determined to be flawed and in need of more research are: accuracy and error rates of forensic
analyses, sources of potential bias and
human error in interpretation by forensic experts, fingerprints, firearms examination, tool marks, bite marks, impressions (tires, footwear), bloodstain - pattern
analysis, handwriting,
hair, coatings (for example, paint), chemicals (including drugs), materials (including fibers), fluids, serology, and fire and explosive
analysis.