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. 2019 Apr 16;30(5):719–730. doi: 10.1007/s13361-019-02164-z

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© The Author(s) 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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(a) Finger prick collection of blood to produce a dried plasma spot. (b1–b3) SRM LC/MS analysis of dried plasma spot from a marijuana smoker showing the presence of the parent compound, THC, along with its two main metabolites, THC-OH and THC-COOH. The lower magenta traces in each panel are the SRM LC/MS chromatogram for the corresponding deuterated internal standard for each compound. Experimental details for this approach are described elsewhere [46]. The labels below of b and bc are incorrect; they should be b1 and b2. Also, they are lower case in the figure but referenced in the text in upper case. Shouldn't they be consistent?