I don't think thats accurate.
Im pretty sure that synthetic weed is not currently banned from the NFL. As hard as that is to believe. Some of the stuff that is considered PED's and weed is banned - but synthetic which is so very dangerous, is not. Its astonishing. Ive read an article from 2014 that it was not banned at that point and read a reddit thread from today saying its not banned. Shocking. no other way to put it. So even if this is proven to be true any way, he;s not going to be suspended.
And a big reason to smoke synthetic weed is to pass the tests. I think you can test positive in some cases but its much more rare and it exits the body much faster.
My advice to everyone - is to get this . . . . illegal in all states (its already federally illegal) as fast as possible. And if you really need something, legalize pot because it is so much safer and less addictive.