Poroscopy in a forensic lab involves which of the following?

Poroscopy is the term applied to a specialized study of pore structure found on papillary ridges of skin as a means of identification. It comes under level 3 detail of identification and hence is more reliable and accurate. It is a fuher study of fingerprints described by Locard. There are plenty of micropores in between the papillary ridges of the skin, which are openings of sweat glands. Ref: Textbook of Forensic Medicine and Toxicology by Nagesh Kumar Rao, Page 100