Significance of Physical evidence

a.Identification:

The physical evidence  merely  used  to identify the offender from the physical  techniques.Identification  has its purpose  to determination of the physical  or chemical  identity of a substance with  as near   absolute  certainty as existing analytical techniques will perform.

b.Comparison:

Another significance of physical evidence is comparison  the collected evidence with the same characters object or the things.Analysis is subject to a suspect specimen, and control specimen to the same  tests and examinations for the ultimate purpose of determining  whether or not  they have  a common origin.