Three teachers in Detroit Michigan felt sick after eating brownies out of the teachers lounge. When the teachers ate the brownies and began to feel sick and sluggish, they went to the hospital and they all tested positive for marijuana. The remaning brownies were tested as well. It turns out that a teacher intentionally or accidentally brought brownies to the school that were laced. There is an investigation by the the School District on determining who brought them too school.
http://www.aol.com/article/2015/12/13/pot-laced-brownies-brought-to-school-lounge-teachers-sick/21282972/?ncid=txtlnkusaolp00000058&intcmp=hplnws