A close-up of cocaine distribution in washed hair strands that were either contaminated with the drug (left two columns) or from a cocaine user (1). Telling the difference is difficult... © 2016 American Chemical Society Would you like your photo featured in Image of the Month? Send it to [email protected]

References
- E Cuypers et al., “Consequences of Decontamination Procedures in Forensic Hair Analysis Using Metal-Assisted Secondary Ion Mass Spectrometry Analysis”, Anal Chem, 88 (6), 3091–3097 (2016). DOI: 10.1021/acs.analchem.5b03979