That’s a yes, then

The clever thing about breathalysers is that you don’t actually need to use them in order to find out whether people have been drinking:

In the early hours, staff tried to breathalyse a number of prisoners because they suspected they had been drinking.
When the prisoners refused to be breathalysed they became violent along with other prisoners and went on what we call a mutiny.

(Also, I do like that “what we call a mutiny” - very Nicholas Parsons.)