We don't know if Pac was clean or dirty because he pulled out of the fight. We can make assumptions but we can't know for certain because he wasn't willing to fight Floyd in 2010 with drug testing unless he could choose the dates which makes testing pointless.
But skipping that, anyone that says PEDs don't work is ignorant. Every single sport where performance can be directly measured it is proven without a doubt to make a tremendous difference. Not a small difference, tremendous! They can give you better recovery so you can train more which makes you better, you can train harder which makes you better, you can train more often which makes you better. PEDs can improve speed, strength, stamina, they can help you gain weight or lose weight to make your body precisely right for your needs. They can improve your confidence which can improve your will. They can give you a rage which can help pain tolerance and drive. The benefits go on and on. And every sport that you can't directly measure success claims "not in our sport" remember "steroids can't help you hit a baseball"? Oh yeah morons? Look at home run totals since testing was implemented and look at totals since it's been improved. It's proven that "steroids can't help you hit a baseball" is f'n ignorant. Steroids can increase bat speed which has many effects on hitting a baseball. Just like that steroids can increase punch velocity. Suddenly that punch that was a fraction late gets there. PEDs can improve stamina so that guy that is arm weary in the 9th is suddenly fresh as a daisy and landing 40 punches. They work and they're f'n dangerous and any scumbag that uses them deserves to be in prison. All PED cheats are f'n cowards. The lowest pieces of shit on earth.
But that is all beside the point. PEDs work. And anyone suggesting otherwise is ignorant.
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