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@M_V
Only UCI environment I've experienced is track but I imagine the track is a much cleaner and manageable environment than a cross race and I could see swapping in a doped bike for a rider in trouble then making it vanish after the race being pretty achievable there.
At non UCI events I've seen junior/youth riders change wheels for one with a smaller cog on pretty much under the noses of the comms and it be either unnoticed or just ignored.