USADA are still testing for it.
The process now is that any cannabis positives are now reported as atypical and there is an investigation. If the investigation determines that the athlete was not intending to improve their performance, then they are not charged with a violation.
If however the investigation concludes that the athlete WAS trying to improve their performance then they are still charged with a violation.
Things that can be considered as performance improving include:
Using cannabis as a pain medication
Using cannabis for in bout anxiety
So its not quite as cut and dried as cannabis now being legal. You are only not charged with a violation if it was determined the use was recreational and NOT performance enhancing.
That said, in five years of the USADA program there have only been THREE fighters who were popped for cannabis.. Three... And in two of those instances it would have been deemed recreational and so no suspension. The only one that could possibly be argued as performance related would be calvillo who was doing edibles as a sleep aid, but its very unlikely she would have been charged.
The issue with commissions, who are responsible for the vast majority of the cannabis suspensions remains.. so in the long run, these changes by USADA mean very little indeed.