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ESDA processing and latent fingerprint development: the humidity effect.

Myriam Azoury¹, Rachel Gabbay, Drorit Cohen

¹Latent Fingerprint Laboratory, Division of Identification and Forensic Science (DIFS), Israel Police, National H.Q., Jerusalem, Israel.

Journal of Forensic Sciences

|May 24, 2003

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Humidification before fingerprint development affects paper evidence. While DFO is unaffected, ninhydrin and indanedione methods show significant changes, impacting forensic analysis.

Area of Science:

Forensic Science
Document Examination
Trace Evidence Analysis

Background:

Effective fingerprint detection on paper is crucial for forensic investigations.
The Electrostatic Detection Apparatus (ESDA) process is a common method for visualizing latent prints.
Environmental factors, such as humidity, can influence the success of fingerprint development techniques.

Purpose of the Study:

To investigate the impact of humidification during the ESDA process on subsequent fingerprint visualization.
To determine the sensitivity of different fingerprint development reagents to prior humidification of paper substrates.

Main Methods:

Paper items were subjected to controlled humidification prior to fingerprint development.
Latent fingerprints were developed using the Electrostatic Detection Apparatus (ESDA) process.

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Subsequent development was performed using DFO (1,8-diazafluoren-9-one), ninhydrin, and indanedione reagents.

Main Results:

The DFO (1,8-diazafluoren-9-one) fingerprint development method demonstrated minimal sensitivity to prior humidification.
Fingerprint development using ninhydrin showed significant alterations due to previous paper humidification.
Indanedione-based fingerprint development was also markedly affected by the humidification history of the paper.

Conclusions:

Prior humidification during ESDA significantly impacts the efficacy of ninhydrin and indanedione for fingerprint development on paper.
Forensic examiners should consider the role of humidity in ESDA processing when interpreting results from these reagents.
The findings suggest that DFO may be a more robust choice for fingerprint development on paper following ESDA in humid environments.