They're all on dude.
Theyve been on since the days of Royce and Shamrock when guys were getting $500 a fight.
Now fighters can make millions.
You're living in a fantasy if you think pro athletes are not.
WADA allows 3:1 T/E ratio, athletes are on roids, but not enough to set off the alarms.
The guide Lines are similar to weight cutting, everybody cuts weight, but it's when an athlete misses weight is he considered a cheater.
Same with steroids, they are all on it, but only those who abuse it to gain an unfair advantage are caught and penalized.
Unless your Jon Jones, where they are literally changing the book and deviating from WADA to accommodate a habitual cheater.