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. 2019 Jun 15;21(6):e13803. doi: 10.2196/13803

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©Jiawei Li, Qing Xu, Neal Shah, Tim K Mackey. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 15.06.2019.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Examples of Instagram posts of illegal drug sale categories (user information and text from post have removed). (1) A post of prescription drugs; (2) a post of lysergic acid diethylamide (LSD); (3) a post with written contact information imbedded in the image; and (4) post with multiple drug types.