PEDs can be, from how it was worded, pot.
It's listed as one currently in the list of "PEDs and Banned Substances", and when they said he failed a test they mentioned for "PEDs or an abusable substance". So it could be anywhere from some kind of PED like winstrol,deca,etc or it could be coke or heroin or even just pot. Literally anything on their enormous list of "Do not use".
It's most likely, given his record, pot.
Also, Drew Brees taking the record from Peyton for TD passes. And in the same night, set the new record for highest completion percentage in a game.