Optical Properties of Drug Metabolites in Latent Fingermarks

TL;DR

This paper explores how the unique optical properties of drug metabolites, due to their split-ring resonator structures, can be used to distinguish latent fingermarks of drug users from non-users, aiding forensic investigations.

Contribution

It introduces a method to calculate the permittivity and permeability of drug metabolites, demonstrating their potential in forensic analysis of latent fingermarks.

Findings

Latent fingermarks of drug users show inverse optical images in UV-vis region.

Drug metabolites exhibit negative permittivity and permeability due to SRR structures.

Optical properties differ significantly between drug users and non-users.

Abstract

Drug metabolites usually have structures of split-ring resonators (SRRs), which might lead to negative permittivity and permeability in electromagnetic field. As a result, in the UV-vis region, the latent fingermarks images of drug addicts and non drug users are inverse. The optical properties of latent fingermarks are quite different between drug addicts and non-drug users. This is a technic superiority for crime scene investigation to distinguish them. In this paper, we calculate the permittivity and permeability of drug metabolites using tight-binding model. The latent fingermarks of smokers and non-smokers are given as an example.