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Bureau of Criminal Apprehension

A Division of the Minnesota Department of Public Safety

Biological Evidence

The identification of various biological samples at a scene can be significant.  The presence of a certain fluid may be of significance in and of itself.  Additionally, biological material can be a source of DNA which can allow an individual to be linked to a scene and a specific biological sample.  DNA can be obtained from a variety of sources including blood, skin cells, semen, hair, saliva and tissue.  Certain types of DNA evidence are more probative than others.  The type of object that the DNA sample is deposited on may also be meaningful.   

  i.   Luminol (Blood)
 ii.   Test for Human Blood
iii.   BCIP (Semen)
iv.   Phenolphthalein (Blood)
 v.   Alternate Light Source