Science

Revolutionary Forensic Breakthrough: Gunshot Residue Transformed into Glowing Semiconductors

2025-04-19

Author: Li

Scientists Illuminate Gunshot Residue Detection

In a groundbreaking discovery, researchers from the University of Amsterdam have found a way to convert gunshot residue (GSR) into a glowing semiconductor. By turning lead particles found in GSR into a luminescent format, they enable the residue to emit a striking green glow when exposed to UV light—making even the faintest traces of gunshot residue visible to the naked eye.

Innovative Semiconductor Technology

This exciting new technique stems from advancements in perovskite technology, a field renowned for its role in enhancing solar panels and LED lights. This effort builds upon work by Wim Noorduin and his team, who previously developed methods for lead detection and founded Lumetallix, a startup aimed at revolutionizing lead detection processes. Their updated reagent is especially sensitive to the lead found in gunshot residue.

On-Site Testing in Action

The Amsterdam police are already leveraging this innovative light-emitting technique in real crime investigations. Forensic expert Bente van Kralingen notes, "Having the ability to detect gunshot residue on-site significantly aids us in answering critical questions during shooting investigations." Officers can now test for traces of lead on clothing, hands, and bullet holes, eliminating the lengthy lab analysis traditionally required.

Exciting Results from Experiments

Further experiments at a local shooting range, conducted by PhD students Kendra Adelberg and Arno van der Weijden, demonstrated that this reagent effectively illuminated residue from shots fired with 9 mm pistols on cotton cloth targets. The glowing patterns were distinctly visible, even from a distance.

Cutting-Edge Implications for Investigations

Remarkably, the glow remained intact even after extensive washing, raising intriguing implications for forensic investigations. In tests, bystanders positioned up to two meters from the shooter also showed positive lead traces. This could fundamentally change how evidence is collected, as suspects frequently attempt to erase traces of their involvement.

Caution Required in Interpretation

While these findings are promising, Kendra Adelberg emphasizes that a positive test result must be carefully interpreted—it doesn’t automatically indicate gunfire. This advancement provides crucial pieces of evidence in reconstructing shooting incidents, making it a potential game changer in forensic science.