I posted last week that a mate knows someone who lives in Holland but works in Belgium, and they've been doing the same thing over in Belgium - health workers who are testing positive but not displaying symptoms are being asked to come into work because they're desperately short of numbers over there to cope with this. It could be the same reason why they're doing it in North Dakota and I think I recall reading somewhere that they've recently been recording the highest number of infections across all states in terms of percentage of population.
Edit - there's an article here which explains the reasoning by this move and pretty much squares with what I said above. The situation is clearly very serious in North Dakota: https://www.grandforksherald.com/ne...ounces-COVID-positive-nurses-can-stay-at-work
Hopefully the health workers are ignoring said advice and staying home when they know they're positive. Save 1 person to kill 2 more off when you keep infecting other people seems a bit mad.