Total crap
This article is garbage. It treats this "report" as if it were some type of study and it's not. Just take a look at the fine print in the report:
Quote: * "Adverse Analytical Finding" is defined in the World Anti-Doping Code as "a report from a laboratory or approved Testing entity that identifies in a Specimen the presence of a Prohibited Substance or its Metabolites or Markers (including elevated quantities of endogenous substances) or evidence of the Use of a Prohibited Method". These figures may not be identical to sanctioned cases, as the figures given in this
report may contain findings that underwent the Therapeutic Use Exemption (TUE) approval process. In addition, some Adverse Analytical Findings may correspond to multiple measurements performed on the same athlete, such as in cases of longitudinal studies on testosterone.
So let's see, basically they are including results from every test whether it was the same person or not and they are including adverse results for substances that the person being tested may have had permission for or that may be otherwise permissable.
One of the prohibited substances is Ephedrine, commonly used cold medicine. I'm kind of thinking this isn't a billiards performance enhancing drug, unless you really have a cold.
This report, in my opinion, deliberately included all possible aspects of findings to make drug use look as rampant as possible in all areas of sports to help justify WADA's existence. "Adverse analytical finding" in this report is not the same as testing positive for illegal drug use.
Now the author of this garbage. She writes:
Billiards players: What on earth are you taking? And why?
Probably "something to calm their nerves so they have better aim or grasp," said James Roach of the WADA. (I’m still waiting for a response from the Belgium-based World Confederation of Billiard Sports.)
This implies that an interview with WADA was conducted and the question was asked as to what all the "Adverse Analytical Findings" were in regards to Billiards, and this James Roach guy answers with a guess!

It's "probably" something to calm their nerves etc.? He doesn't know. That's the real answer to the question, but the author decides to ignore reality and highlight the guess anyway.
Crap journalism plus a crappy "all inclusive" report by the WADA equals an insult and a complete waste of everyones time.