Rick Arthur was on the Roger Stein show yesterday (11/18/12 - see link below), where he touched on the lasix issue and said that the addition of lasix results in the horse running 3 to 5 lengths faster per published research (Diane Gross, American Journal of Veterinary Research,1999). Additionally, he provided and overview on TCO2 testing, where ALL HORSES ARE TESTED on the SCal circuit.
http://www.rogerstein.com/archives/121118.wma