Its already very common that such accommodation requests get filed with associated medical paperwork from a medical professional outlining why the accommodation is what the person needs. That alone should be more than enough[0]
Secondly, why don't we simply trust adults to make decisions about how to manage their conditions, especially if there is no demonstrable issue with how they work with their team and their work is up to standard.
[0]: Its been some time since I haven't simply produced such paperwork to go along with a request, but if you don't produce it upfront if I recall correctly employers reserve the right to ask for more information, which typically boils down to getting associated paperwork from a medical professional
I don't think pet-food companies will be paying doctors to approve support animals, so probably most of this will have to come from the patients themselves.
Chinese fentanyl typically doesn't need a script.
The pill mill part of the opioid epidemic was decades ago. Today, access to pain meds is better described as a war on pain relief. People in chronic pain with no history of abuse are denied everywhere, every day.
I know a number of people who turn to the black market because it is their only option.
Twenty years ago I knew opioid addicts utilizing pill mills. I no longer do.
Today I know people in chronic pain buying illegal opioids because that is the best of their awful choices.