Supplementary information files for "Detection of trace fentanyl in latent and developed fingermarks using atmospheric solids analysis probe (ASAP) mass spectrometry"

Latent fingermarks are typically visualised using an appropriate development technique before additional chemical information is recovered. Therefore, further studies assessed the ability to detect fentanyl in spiked fingermarks following three development techniques: cyanoacrylate (CyanoBloom), cyanoacrylate with UV dye (PolyCyano UV), and cyanoacrylate followed by staining with Basic Yellow 40 (BY40). Fentanyl was still detected after all three development methods tested, with detection limits reaching 10 ng or less present on the surface.

This highlights that trace chemicals can be retained in fingermarks and recovered after development, the success of a simple liquid extraction method to recover analytes of interest and demonstrates how ambient ionisation methods are capable of reliably detecting analytes such as synthetic opioids from a complex matrix. This further exemplifies ambient ionisation as a solution to forensic testing backlogs by providing valuable information to criminal investigations quickly and effectively.<br><br>© The Author(s), CC BY 4.0</p>