@JackMark 18:18 May 3, 2017
No room to add to my comment on your answer. You can't extrapolate from the use of the uncountable and plural usage of one word to another. It may seem logical that the phrase "police powers" should indicate that the WHO would have "authorities", but it just doesn't work like that. "Authorities" is used to mean a number of official bodies having authority, not a number of types of authority possessed by an official body. However it can also be used as an alternative to "authorisations", which is the case here.
"Police powers" is actually an interesting example of specific usage, because it is used for legitimate powers granted to the police. On the other hand "police power", uncountable, is often used to mean illegitimate or oppressive use of power by the police. | 
peer agreement (net): +2
