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. 2020 Feb 6;10:1974. doi: 10.1038/s41598-020-58856-0

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Mass per fingerprint of cocaine detected in fingerprints collected as presented (AP) from 3 donors (D1, D2 and D3 respectively), (A) at various time points up to 48 hours (short term) after touching 2 mg cocaine of 99% purity and (B) at various time points up to 12 days (long term) after touching 0.5 mg and 2 mg cocaine of 99% purity.