I thought that individual anecdotes would be less convincing than evidence that "economically motivated adulteration" is an entire classification for such crimes used by the FDA, which was created to prevent them.

Its not hard to find specific examples. 5 minutes of searching will find piles and piles of them.

If you must have a name, Stewart Parnell was convicted of knowingly distributing salmonella contaminated peanuts in 2015. 9 People died. He got 28 years in prison.

You don't have to trust the news either. Just ask around. I know a teacher who has lost two students to surprise fentanyl. I'm sure there are similarly affected people in your community. Unregulated markets are a slippery slope towards deaths by poison. It happens all over the world (but more in places without an FDA equivalent).