Something I've been curious about would be the use of Reg-U-mate or
implants for mares to mitigate some of the hormonal weirdness they can be
prone to. If the same effect can be accomplished by getting them pregnant
or by mutilating (spaying) them, why is it wrong and against the anti-drug
rules to produce the effect temporarily. If the point is to be strictly
natural then all the male horses ridden should be stallions.