Category Archives: Fingerprints

Black Powder Processing

By Pat A. Wertheim

This article originally appeared in “Minutiae”, The Lightning Powder Co. Newsletter, No. 42, May-June 1997, p. 6.

Although old-fashioned black powder is the workhorse of fingerprint development
techniques for crime scene use and is also an important method in the laboratory,
maximizing the effectiveness of powder requires far more sophistication than
simply dipping a brush into the jar of powder and painting it onto a surface.

More control can be exercised over black powder by working out of a shallow
dish. The perfect disposable dish can be made by cutting or tearing a blank
inked fingerprint card from any edge into the center of the card. Overlap
the two edges of the cut by about an inch (two or three centimeters) and
tape the card back together to make the dish. A large laboratory weighing
dish may be used, or any other shallow dish or bowl. Place one-half to one
teaspoon of powder (approximately one millilitre) into the dish. Continue reading

Hidden Evidence: Latent Prints on Human Skin

By Ivan Ross Futrell
Mr. Futrell is a supervisory fingerprint specialist in the Latent Fingerprint
Section of the FBI Laboratory in Washington, D.C.

This Article Originally Appeared in the FBI Law Enforcement Bulletin, April 1996.

(Recent research proves that identifiable prints can be obtained from the
skin of homicide victims under real field conditions, not just in the
laboratory.)

Whether to stop them from fleeing, immobilize them, or dispose of them, murderers
often grab their victims. What homicide detective has not wished for the
ability to develop identifiable fingerprints of a suspect from the skin of
a dead body? Crucial fingerprint evidence linking the perpetrator to the
victim must be right there, but, until recently, attempts to retrieve those
prints rarely met with success. Continue reading

Case Study: Conviction Through Enhanced Fingerprint Identification

This article originally appeared in the FBI Law Enforcement Bulletin, December 1992.

In March 1990, an unknown assailant sexually molested and fatally stabbed a young woman. At the crime scene, an investigator discovered few leads. The only evidence was a pillowcase, found adjacent to the victim’s body, that exhibited several bloodstains. One stain showed some faint fingerprint ridge detail, barely visible even to the trained eye. Continue reading