Yes, someone is. In fact there was a cue sports drug test failure five or ten years ago. I can't find any links to it which is just as well since it was some kind of prescription drug confusion, IIRC. I don't think cue sports have many PEDs available.
I think it was recently decided that WADA itself would be in charge of the testing rather than labs selected by the sports organizations. Maybe that was fall-out from the Rio Games.
In order to maintain international recognition the WPA/WCBS must have some level of testing. International competitors can potentially be tested at any time.
There has been testing (and failures) in Snooker. See http://www.independent.co.uk/sport/...-drug-tests-but-remain-anonymous-1155528.html
and http://snookerscene.blogspot.ca/2008/10/snooker-players-tested-out-of.html
My question was whether anyone was testing pool players. Is anyone actually testing pool players? Are they really paying the cost? I would like to know - I don't pretend to have the answer.
I get why they have the WADA policy, but unless they are actually doing the testing, it is window dressing (even if required window dressing).