<blockquote>Why did the field tests come up positive for pot?  <a href="https://www.washingtonpost.com/news/the-watch/wp/2015/02/26/a-partial-list-of-things-that-field-testing-drug-kits-have-mistakenly-identified-as-contraband/">As I wrote back in Februar</a>y, it’s almost as if these tests come up positive whenever the police need them to. A partial list of substances that the tests have mistaken for illegal drugs would include sage, chocolate chip cookies, motor oil, spearmint, soap, tortilla dough, deodorant, billiard’s chalk, patchouli, flour, eucalyptus, breath mints, Jolly Ranchers and vitamins.</blockquote>
via <a href="https://www.washingtonpost.com/news/the-watch/wp/2015/12/28/federal-judge-drinking-tea-shopping-at-a-gardening-store-is-probable-cause-for-a-swat-raid-on-your-home/?utm_term=.1ecdcee85d5a">Federal judge: Drinking tea, shopping at a gardening store is probable cause for a SWAT raid on your home - The Washington Post</a>.
<blockquote><a href="https://ecf.ksd.uscourts.gov/cgi-bin/show_public_doc?2013cv2586-340">Last week</a>, U.S. District Court Judge John W. Lungstrum dismissed every one of the Hartes’s claims. Lungstrum found that sending a SWAT team into a home first thing in the morning based on no more than a positive field test and spotting a suspect at a gardening store was not a violation of the Fourth Amendment.</blockquote>