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.