Krishan's research focuses on human morphology and its forensic applications within Indian populations. He has authored contributions for
Encyclopedia of Forensic Sciences 2nd Edition and
Encyclopedia of Forensic and Legal Medicine 2nd Edition published by
Elsevier in 2013 and 2016 respectively. A primary focus of his work is
forensic podiatry of the north Indian population. His studies have examined the correlation between
body weight and
footprints and its interpretation in
crime scene investigation. He also established some of the unique and individualistic characteristics of the footprints that are helpful in the identification of criminals. He devised and calculated the effect of limb asymmetry on estimation of
stature in forensic examinations. Krishan developed a novel index called
Heel-Ball Index in the forensic literature emphasizing its relevance in
sex determination. He has published unique work on the
footprint ridge density of Indian population and its significance in
forensic identification. ==References==