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Originally Posted by Kasept
The theory is that shake users have fine-tuned the bi-carb mix and amounts given to keep the CO2 levels in the horse below the threshold that tests as a milkshake positive. Since horses have widely differing levels of CO2 in their systems, the positive level is quite high. So a horse testing just under the threshold positive level can very well have been been shaked.
A very prominent trainer, who has been around, has told me that he is sure that shakes are the majority of the seemingly outrageous performances we see from certain trainers and certain horses.
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Thanks for the info. Steve.