 His third area of research interest was forensic genetics, i.e., the use of DNA data and genetic methodology in the process of individual identification initially in criminal and civil cases, and later in determining ethnic ancestry and relationships.One of Dr. Chakraborty's main contributions to the methodology of identification by DNA data concerned the selection of control groups for ruling out errors in identification and for calculating precise probabilities of the two types of errors (false positives and false negatives).He also contributed to the study of microbial forensics, i.e., the rapid identification of bacterial agents used in bioterrorism and biocrimes.