Description :
A successful crime investigation depends on collecting and analyzing different types of evidence. Forensic scientists classify evidence in different ways and have specific ways of handling it. One of the main differences is between physical and biological evidence. Physical evidence refers to any element that comes from a non-living origin, while biological evidence always originates from a living organism. The most important types of physical evidence are fingerprints, tire marks, footprints, fibers, paint, and building materials. Biological evidence includes blood stains and DNA.