Seems to be much closer to Derby testing than Preakness, with OOC testing and the like. Has been the demise of many a horse, some better than Chrome.

alang: 72 hour surveillance for Belmont, Met Mile, Manhattan and Odgen Phipps and all have OOC testing. All other stakes, horses must be on grounds by noon the day before.

http://gaming.ny.gov/pdf/05.21.14.BelmontStakesDay.pdf