An aspect unique to ultrarunning occurred to me just today as I contemplated my drop bag strategy for Canyons, taking into account everything that will be available at aid stations, and that is as an athlete who doesn't have to worry about doping regs, I can take whatever is offered at aid stations. But consider the high profile Olympian who will be running through some of the same aid stations- can she take any unpackaged aid without concern that it could be tainted? Elite marathoners have their own bottles, which fall under a strict chain of custody. The came can't be said for the jug of water a volunteer filled with a hose the night before. Will inevitable stricter scrutiny change how aid stations work, especially for the elites?