Dana White: It's Not That Simple To Enforce UFC Drug PolicyUFC commissioner Dana White weighs in on Jon Jones' latest positive drug test and shares why Jon Jones vs. Brock Lesnar is unlikely to happen.SI Staff|Share on FacebookShare on XAdd us on UFC commissioner Dana White weighs in on Jon Jones' latest positive drug test and shares why Jon Jones vs. Brock Lesnar is unlikely to happen.Published Oct 13, 2017 | Modified Oct 13, 2017SI STAFFShare on FacebookShare on XHome/MMA