NCJ Number
205138
Journal
Journal of Forensic Sciences Volume: 49 Issue: 2 Dated: March 2004 Pages: 290-299
Date Published
March 2004
Length
10 pages
Annotation
This article describes the development of a device capable of fuming fingerprints with cyanoacrylate to allow a remote-controlled robot to collect latent fingerprint evidence from suspicious packages.
Abstract
Recent world events have created the need for safe and effect means of dealing with terrorist threats. The Calgary Police Service (Canada)demonstrated a need to develop a safe method of collecting fingerprints from suspicious packages. A protocol was developed for suspicious package situations in which suspicious parcels are approached and assessed by a remote-controlled robot. Additionally, the Calgary Police Service Tactical Unit developed a small cyanoacrylate fuming chamber that can be placed over a small package by the robot in order to allow for the collection of latent fingerprints. The two challenges of this approach are that this method can only be used with small packages and the method may disturb the package. Thus, the goal of the research reported in this article was to improve upon the design to minimize these two challenges. Specifically, the authors eliminated the fuming chamber and generated a higher volume of fumes. The fume generator uses directed cyanoacrylate vapors to develop latent fingerprints. An overview is provided of the basic techniques for latent fingerprint development and the methodology used to develop the prototype fingerprinting device is enumerated. A series of preliminary tests were conducted to determine: (1) vaporization of the glue, and (2) the production of high quality prints in a timely fashion. In terms of vaporization, three fuming methods were investigated for their effectiveness: open conduction heating, contained conduction heating, and convection heating. Water steaming and water misting were investigated as accelerated fingerprint development techniques. Following a review of the design criteria, the results of the preliminary experiments into cyanoacrylate vaporization and fingerprint development are presented, as are results concerning the design of the prototype. Results demonstrated that effective cyanoacrylate fuming can be accomplished only with sufficient heat, humidity, and airflow. Recommendations for design enhancements include the addition of a fuming shelter and a steam emitter. Tables, figures, references