DHS releases findings of maltreatment investigation into former school employee accused of giving infant melatonin Accused staff person said tablets in question were "mints", helped with their “gag reflex” when changing children’s diapers. Author: Jennifer Hoff Updated: 6:05 PM CST February 8, 2021 NORTHFIELD, Minn. — There's new information about the case involving a Northfield Public Schools employee who was fired for allegedly putting melatonin in a child's bottle. A new report from the Minnesota Department of Human Services found this may not have been an isolated case and could've been happening for two years. The DHS investigation dates back to 2018 when co-workers of the person in question allegedly found tablets similar to what they discovered three months ago.