Jimbo-- as I pointed out at the time, a few weeks ago a bunch of horses coming synth/dirt ran without improvement (it was the weekend of the Sunland Derby). A few did improve.
The ones that prefer dirt will improve. The ones that don\'t won\'t. Some of the ones that do prefer it will explode, either because they have in effect been prepped and prepped without having a chance to run their race, or because training on synth gets horses really fit, or for some other reason.
Note-- when I talk about synth here, I\'m not talking about Cushion, which is like dirt.
There is also the issue of figure (and field) compression, which has been discussed here at length.
And finally, this-- California is by far the best at stopping drug use. Specifically, they are the only one doing blood testing for Clenbuterol. Raceday Clenbuterol-- which doesn\'t make it into the urine in time to be tested for-- is rumored to be the drug of choice for several top trainers.
By the way, anyone know what type of synthetic those horses train over in Dubai?