Makes me wonder how many others there are that don't have an illegal hose attached to the outside.
There should be random unannounced business inspections. Even when shit isn't as shady as this, when I worked in an ice cream factory, they knew when health inspections were coming and went into high cleaning mode immediately before. While I don't think they would have failed if they didn't do that, it's not very useful to do inspections only after a business does a deep clean, so there's no way to know.
So random inspections that aren't announced until the inspector is at the gate, plus offer nice rewards for people reporting a PA announcement to do some quick cleaning (or say the company has to hand over video footage for the hour before up to the hour after).
In your extensive experience, how common are unlicensed biotech R&D facilities being run in secret? And I see no reason being capable of biotech R&D would preclude it from being capable of more malicious purposes. If anything, I'd assume a significant amount of overlap between the two capabilities.
I don't see how it's cheaper to maintain an entire facility and staff just to take care of unwanted items, but I concede it's a possibility, bureaucracy and inertia being what it is.