Footprint Analysis:-
Evaluation of two-dimensional footprint impressions for comparison purposes are carried out in the field of forensic identification by one or more of the following methods; overlay, Robbins, Gunn, Rossi and the Optical Centre Method.
Three methods for barefoot examination are commonly employed–
A.) Gunn Method: One such method devised by Gunn involves taking multiple linear measurements of the footprints that are being compared. Gunn's basic method involves drawing six lines, five of which come from the rear foot and extend to the apex of each digit. A sixth line is then drawn across the ball of the foot at the widest area.
B.) Optical Centre Method: A distinct point on the foot is identified and concentric circles are drawn in its most suitable location. This point is then isolated and then connected to other recognized regions of the footprint by means of lines.
C.) Overlay Method In the overlay method, the forensic practitioner places a sheet of clear acetate over the question print. The question print may be recovered from the crime scene and presented either in its true form (for example a bloody footprint on a piece of flooring, removed in its entirety), or as a latent print (for example on lifting film) but more often than not, as a life-sized evidence photograph. A fine-tipped marker pen is used to trace around the outline of the exemplar print and the acetate then transferred and placed over the question print.
