WWE.com just posted the following:
In accordance with its Talent Wellness Program, WWE has suspended Luis Ignascio Urive Alvirde (Sin Cara) for 30 days for his first violation of the company's policy.
There is no additional information in the version on the WWE Corporate website.
As usual, WWE did not disclose the substance that he tested positive for.
Sin Cara, formerly Mistico in CMLL, was written out of storylines for the time being at last night's Money In The Bank PPV with an injury angle during the Smackdown Money In The Bank ladder match that opened the show. Sheamus powerbombed him through a ladder bridge and he went into convulsions before being stretchered out.
This should be a very interesting story to follow for a variety of reasons.
The first and most obvious one is that Sin Cara is Triple H's first hand-picked project since taking over talent development. WWE made an unprecedented move by reportedly signing Cara's best opponent/good friend Averno so he could have better matches to help push him. A few months into this push, he gets suspended for failing a drug test. He would have presumably passed a drug test to get hired. The trajectory of his push probably depends on a number of factors: What type of substance was it, is it a prescription drug that he didn't have a prescription for (especially since it's easy to procure prescription drugs without a prescription in Mexico), will Triple H take offense to it, etc.
Second, WWE has released Sin Cara's real name. He's probably furious about this even though it's a standard part of the wellness policy to release it with a drug test failure. In Mexico, masked wrestlers' real names are only announced when they lose their masks. Depending on what he actually did (especially if it would've been standard operating procedure in Mexico), he could end up throwing a fit over this to the point that it actually becomes a bone of contention between him and WWE.
Finally, there's Averno. As of right now, he's still working shows all over Mexico for CMLL. He lost his mask to La Mascara a month ago. Everyone figured that he'd stick around CMLL for a week at most so he could work a TV taping and a bunch of live shows without the mask and show the fans his face, but he's still a regular. He had been booked for a specific date a long ways out, so that's why he's been sticking around. Hopefully for him, this committment to leaving with notice keeps him from being blackballed by CMLL, though I wouldn't necessarily count on it as long as Paco Alonso is in charge of the company. Now, his position with WWE seems a lot more precarious that it did just a few days ago.