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Determining storage for pressure-sensitive tape evidence: A long-term study.

Susan T Gross¹

¹Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), Beltsville, Maryland, USA.

Journal of Forensic Sciences

|August 9, 2024

Summary

Forensic science research found that FedEx backings, adhesive sheet backings, and polyester transparency sheets are optimal storage materials for pressure-sensitive adhesive (PSA) tape. These substrates minimize interference, ensuring accurate analysis of trace evidence.

Keywords:

adhesive long‐term storage short‐term storage pressure‐sensitive tape tape evidence storage trace evidence

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Area of Science:

Forensic Science
Materials Science
Analytical Chemistry

Background:

Pressure-sensitive adhesive (PSA) tape is crucial trace evidence in forensic investigations.
Optimal storage materials for PSA tape are not well-researched, potentially impacting evidence integrity.
Substrate interference can complicate tape removal and adhesive analysis.

Purpose of the Study:

To identify the best storage substrate for PSA tape, minimizing analytical interference.
To evaluate the long-term effects of various storage materials on PSA tape properties.
To ensure the reliability of forensic analysis of PSA tape evidence.

Main Methods:

Long-term study (10 years) involving 80 PSA tape samples on 8 different substrates.
Evaluation of tape removal ease at multiple time points.
Analysis of adhesive composition using Fourier transform infrared spectroscopy (FTIR), pyrolysis gas chromatography-mass spectrometry (PyGC-MS), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), and x-ray fluorescence (XRF).

Main Results:

FedEx backing was the only substrate showing no adverse effects on tape removal.
FedEx backings, adhesive sheet backings, and polyester transparency sheets exhibited minimal adverse effects on adhesive composition.
These substrates proved effective for both short-term and long-term PSA tape storage.

Conclusions:

FedEx backings, adhesive sheet backings, and polyester transparency sheets are recommended for storing PSA tape in forensic science.
Proper substrate selection is vital for preserving the integrity of adhesive evidence.
This research provides critical data for optimizing forensic trace evidence handling protocols.