Two common types of fingerprint sources submitted for DNA analysis are from sweaty or bloody latent fingerprints. The DNA provided through a sweaty handprint is from cells sloughed off during contact with a surface. In a bloody fingerprint, the DNA comes from the white blood cells. In the case of bloody fingerprints, however, it is important to be aware that the primary source of DNA being obtained is from the blood source and not from any sloughed-off cells of the individual who left the fingerprint. The amount of the sample is important in determining whether there is sufficient DNA to obtain a profile. Due to the large number of white blood cells, blood has a high concentration of DNA; therefore, an area the size of the head of a pin is usually sufficient to obtain a profile. Priority should first be given to the lifting and photographing of the fingerprint. Areas that are deemed not to be of evidentiary value by the latent print examiner can then be swabbed and transferred to the forensic-biology section of the crime lab for DNA analysis. The dual use of both fingerprint and DNA identification technologies provides the investigator with two means of identifying an unknown subject.