Springfield, Ill., police told Dartavius Barnes his daughter's ashes had tested positive for drugs - The Washington Post

… The incident is the latest to illustrate the risk of false positives in field-testing drug kits used by police, which in recent years have incorrectly detected drugs in objects including chocolate chip cookies, deodorant, breath mints and tortilla dough. In 2018, a Tampa Bay mother of four spent five months in jail after her vitamins falsely tested positive for oxycodone, the Miami Herald reported...

https://www.washingtonpost.com/nation/2021/05/21/dartavius-barnes-daughters-ashes-mixup/