Evidence is very, very important
in a crime investigation. Without evidence, it is very unlikely for the
forensic scientists to solve the case. The important evidences one can have
is prints, and traces.
The prints that a person have at birth are his for life, no two individuals
have the exact same pattern of prints.
Earlier individual identification systems like
Bertillion's prisoner measurements process
which took a dozen or so body measurements in order to catalog individuals)
were abandoned because it was too difficult
to search through thousands of files by hand to find a person with one arm a
centimeter longer than the other.
In 1900, Sir Edward Richard Henry created a
classification system using fingerprints
that is still being used in the United States today. Fingerprints cannot be
borrowed, stolen or forgotten.
3 Types of Prints
Patent prints: Prints that are made observable by extra
substances that coat the skin and are transferred
to some object. They need to be evaluated individually and may need to be
moved to the lab before a lift
(a collection of the material making up a print) can be made.
Latent prints: Prints that are
not generally visible to the naked eye which result from the transfer of
oils and salts from the skin to some surface. They may be visible under the
right light, or need augmentation by powder or
Impressed prints: Prints that are
not transferred from the skin to other surfaces, but instead are actual
physical moldings of a set of friction ridges. They can be lifted by
capturing photographs of it, reverse
molding or casting.
*Prints can be from fingertips, ears, palms, soles, and lips.
Traces, on the other hand, can cover everything from tire dirt to broken
glass to carpet fluff to hair strands
to cigarette butts. But, there can also be hazardous evidences such as
chemical threats (any compound injuries if ingested,
inhaled, contacted or ignited), biohazards (biological fluids that can carry
AIDS, or other viruses) and explosive threats (materials that indicate the
presence of explosives).
Back to Main
Back - The Scene Of The Crime
Next - The Scene Of The Human Body
Give comments here!
visit my classmates' web pages!