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. 2021 Mar 14;3:6. doi: 10.1186/s42238-021-00064-2

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Frequency of reported THC content around the 20% threshold among subsets of labs. This figure consists of four plots showing histograms of the frequency of reported THC, with bins to the left of the 20% threshold shaded red and bins to the right of the 20% threshold shaded blue. Plots are left-truncated at 10% for presentational purposes. The top left plot (panel a) shows data from two labs in Washington state which had their licenses suspended (“suspended labs”), and the top right plot (panel b) shows data from the lab in Washington which tested the most products during the study period (“largest lab”). The bottom row also plots histograms from the suspended labs (left; panel c) and the largest lab (right; panel d) but only using testing data from those growers which sent products to both sets of labs. While the two suspended labs show sharp increases in frequency at the 20% threshold (panels a and c), the frequency distribution for the largest lab is smooth across the 20% THC threshold (panels b and d). Histogram bins were generated via the DCdensity function