Tomorrow is an important day for UFC fighters under the new USADA drug testing program. By Wednesday, everyone on the roster has to submit a form to update USADA on their whereabouts at all times due to the new out-of-competition testing rules. Fighters can be subject to random drug tests on any given day 24/7/365 (or 366 next year). Inaccurate info on a whereabouts form -- in other words, you aren't where you say you are -- would result in a failure. Three failures would be the equivalent of a failed drug test, which means a suspension.
This is obviously a very important part of the new policy for everyone involved, and USADA's Twitter account made the last reminder to UFC athletes to get their filings in today.