Jon Jones hasn't been clean since they day he started as a pro MMA fighter (and likely as an amateur too, for all we know) because: Once a cheater, always a cheater.
He cannot undo his past nor his destructive, addictive, and cowardly habits once they have defined him. The past is clear. This hearing is the nail in his coffin (MMA career-wise). Disgustingly, even if he comes back to MMA in August of this year, which is preposterous for justice, he will definitely be a shell of himself and get smashed very soon by a clean fighter who will have the edge on him physically and mentally. He deserved a 5 year ban, imo.
His official MMA record should be for all logical purposes: 0 wins, and all losses via (steroid intake).
To the cheat's sympathisers: One fraudster's wrongdoing doesn't implicate normality. Good and bad will never be one. Truth will always be filtered from falsehood.
Cheaters never prosper!