USADA split triggers uncertainty over UFC drug testing requirements amid McGregor return
- USADA and UFC partnership ending in January 2024 after dispute over McGregor's return
- McGregor re-entered USADA testing pool but may not complete six-month requirement
- USADA stated UFC decision could undermine progress in protecting clean sport
- UFC announced new partnership with Drug Free Sport International for 2024 testing
- No immediate plans confirmed for McGregor's return to octagon competition
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