Valdez is using the excuse that the substance was in an herbal tea and he took it unknowingly. That is an incredibly weak excuse so it is likely he was using it for something prohibited. In my opinion he should be stripped of the world title and suspended for the next six months.
Not a strong excuse to prevent losing his title, rules are rules and once you've got caught, there's nothing you can do but to follow, as for sure there's other implemented rules regarding his case.
the suspension may follow his belt being removed from him, not sure, but in any sport, dietitian is important to know the substance of each intake that the player/fighter is using.
He's camp needs to be extra careful after this. There are lots of regrets by now but nothing that he can do.