Well, I have not done the injecting bit, but I have just walked into more than one ICU… It’s not hard. Nurses and security both are over staffed and underpaid.
(I work in contract security- at one point part of my job was pen testing. Chilled with an interesting fellow named Edgar, while waiting to get caught. Didn’t have anyone to talk to, so, we just chatted. Mostly he chatted.)
harder at night but only because there’s fewer people.
Unless there’s a specific reason someone needs high security… the security is largely a joke.