There is pretty extensive testing throughout the industry. Small hemp farms don't want to murder their customers or themselves.
Nobody wants to harm their customers, but it 100% happened in the early days. A lot of harm is/was not immediately obvious. Of was repeated exposure to harmful chemicals. Good intentions are great, but resources and incentives still matter. Nobodyv wants to get hacked, but building a new feature over hardening is what stops you from getting yelled at