On May 3, police were called to the offices of MMI after the company got a tip about a certain employee who'd warned she was going to bring in some dosed brownies for the sendoff. This woman and the departing coworker evidently had some bad blood, and she was hoping to totally spoil the going away for everyone who attended. Details on the origin of the ongoing spat aren't clear, but according to Michigan Live, employees interviewed by the police said that "there may have been some previous tension" between them. Which, duh.
Fortunately for the sweet-toothed employees, the dastardly plot was foiled at the last minute. When the cops showed up, they confronted the employee and asked point blank whether she'd put laxatives in the brownies. She denied it, but when they threatened to forensically test of them, she caved. In the end, the cops didn't arrest her, but she was fired on the spot.