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At the moment, we have an accusation against Islam, and no evidence whatsoever. Just people assuming Dan's telling the truth because of insider knowledge. Also, I'm wondering why it is against the rules? Call me uneducated, but an IV could just be for rehydration. If a fighter is dehydrated because of the weight cut, and was sent to hospital it's exactly what they would do. So, Dan Accusing him of cheating, isn't exactly true. Cheating implies there's an advantage to be had. I guess, you could look at it like; it's not allowed, and therefore anyone that does IV does get an advantage. However, I'm not sure why it would be banned in the first place. It's definitely not to prevent fighters from nearly killing themselves, because we've seen plenty of evidence to suggest they really push the limits to cut weight.
USADA made this rule because IV will help in increasing the plasma levels and they claim that using IV will have a huge difference in the athletes biological passport.
Regarding the accusation, i believe USADA will be collecting samples after the event as well and they can verify easily if the accusation is true or not. I heard complaints regarding the recovery timings for UFC 284 from the Islam camp as all the fighters got only 24 hours to recover, usually they get 48 hours to recover after weight cut and Zubaira Tukhugov had to be in the arena at 2 AM after the weigh cut with not enough time to recover or got the time to take rest and that affected his performance.
I think I'd want my fighters getting fluid into them at a controlled rate to be honest. Sounds, like it'd be safer especially by a nurse. Again, not defending anyone here, but taking the accusations with a grain of salt. However, I'm also interested in the rules surrounding hydrating yourself after a weight cut.
Water intake and normal food, no other external effort to hydrate yourself during the event. Majority of the top fighters have a nutritionist who take care of these things.