In the series of providing information about availability of latest technology in the field of forensic sciences here is a latest equipment for obtaining Latent prints without using any powder, fumes, chemicals or high intensity light sources( also called Alternate Light Source ALS). Forensic evidence collection techniques are advancing at a tremendous rate. Thermal Fingerprint Developer( TFD-2) is a chemical free method for the development of latent prints on paper items.
The TFD-2 is an automated, high throughput device capable of developing latent prints on large quantities of paper. The device raises the temperature of the documents causing a chemical reaction between the fingerprint residue and the paper, producing a fluorescent by-produce visible under ultraviolet light.
This system offers the following advantages over other development techniques:
- Latent print can be detected in seconds
- No chemical process required
- Contactless system reduces the risk of cross contamination
- High throughput reduces search time
- Can be uses sequentially with other development processes.
The Thermal Fingerprint Developer (TFD-2) developed by Foster and Freeman is the first commercially available instrument to solely utilize heat treatment to visualize latent fingermarks. The chemical-free TFD-2 was able to develop latent fingermarks on a variety of substrates. The manufacturer’s guidelines with regard to the optimal treatment settings were suitable for the more common substrates such as white copy paper; however, new protocols were required for the treatment of thermal paper. The TFD-2’s ability to develop these samples and its use in sequence with traditional chemical reagents, such as 1,2-indanedione and physical developer, were demonstrated. The thermal developer may offer quick and easy heat application options for existing fingermark development reagents. However, the TFD-2-developed samples lacked the detail and contrast afforded by conventional amino acid-sensitive reagents under most conditions.
A new method for the detection of latent fingermarks on paper surfaces using p-dimethylaminobenzaldehyde (DMAB) is described. The method is based upon the reaction of DMAB with the amino acids present in the latent prints.