Forensic hair analysis is a scientific way of examining trace evidence from a crime scene. It includes investigative the hair shaft, including its medulla (inner core), cortex (intermediate layer) and cuticle (outer covering) through influential microscopes. Hair evidence must be collected properly and analyzed according to protocols. The first step of the examination involves verifying whether the hair in question is that of a human or an animal. They often have coarse guard hair external to softer fur hairs.