Like I asked, is safety a concern for EVERY occupation? Sounds like ideology rather than research talking.
I assume too, that you are driving yourself to and from work.
You've not heard of public transportation?
Most company’s now have drug free workplace policies. They do this to get lower insurance rates. If a person is taking 4 Vicodin per day, it would mean that they’re either taking the tabs also while work, or they’re cramming down 4 tablets when they get home before bedtime.
Doesn’t matter if they’re a secretary or a laborer, they would not be in compliance.
I think it would be difficult to preclude someone from working for taking the occasional opioid once per day, maybe an extra one over the weekend, who doesn’t fill the RX 0f 30 every month. But I find that I am not going to pass a person for employment who is taking 3 to 4 opioids per day, to be able to work on most jobs, esp those that require any motor vehicles.