When cannabis is regulated, products undergo testing for things like potency...

https://www.stealth-bookmark.win/regulated-cannabis-is-tested-for-things-like-potency-and-contaminants

When cannabis is regulated, products undergo testing for things like potency and contaminants—including mold and pesticides—so you know what you’re getting. Unregulated cannabis can vary widely, making it hard to gauge strength or safety