Absolute joke of a league. Not only do they want to enforce unenforcable drug tests, they want to do it with the least effective drug test on the market. (probably because they're cheapskates)
Saliva tests are effective in testing what you've ingested in the last 72 hours. Something like THC can show up in Urine up to a month later, whereas with an oral fluid swab it's only going to detect if you're high right now or done something in the last couple days.
But it's also incredibly easy to beat, cheat, or falsify a Saliva test, and they've been known to throw false positives. Over-the-counter Cold remedies, Allergy decongestants, and Diet Pills can show up as Amphetamines.
I'm interested to see what type of testing WADA does for events in North America, and if they treat esports like they do cycling and the UFC. Like, are they going to come to a player's hotel room at 4am and wake them up and make them piss?