[pbhjpbhj]

>the employee who did a mistake //

Single employees, no matter how senior they are, shouldn't be able to perform an action like this. There's got to be systemic gross incompetence to even allow a single employee opportunity to access a large batch of fatal disease carrying material without oversight. I doubt very much this was a case of "oh the intern threw out the wrong barrel of disease, shucks".

[hga]

Here are examples of domains where the two-man rule is used: https://en.wikipedia.org/wiki/Two-man_rule

Given that most people are effectively vaccinated for polio, I can see this plant being not quite so strict.