From the 2011-2012 NCAA Drug Testing Policy Guidebook found on ncaa.org.
Which states that an athlete can have the test delayed until their final event. The key is not to sign the form and tell them that you will take the test the next day. This is on the medical and coaching staff at Washington to know this.
5.8. Notification of Student-Athletes for NCAA
Individual/Team Championships Testing.
5.8.1. At NCAA individual/team championship
events, a student-athlete will be notified of
selection for drug testing immediately after
competition. Any student-athlete selected for
drug testing will be handed a Student-Athlete
Notification Form by an official courier. The
notification form will instruct the student-athlete
to accompany the courier to the collection station
within one hour, unless otherwise directed by the
certified collector or designee.
5.8.2. If a student-athlete is selected for drug
testing during that championship, the NCAA
drug testing administrator or designee will direct
the student-athlete to be tested immediately, to
defer testing until the completion of his/her final
event of that session or day, or to defer testing
until the completion of his/her final event of the
championship.
5.8.3. The courier and selected student-athlete
will obtain an official institutional representative’s
signature on the notification form if testing is
deferred until completion of the student-athlete’s
final event of that session or day or completion of
his/her final event of the championship, as noted
on the form. An institutional representative must
present the student-athlete to the collection station
and certify identification of the student-athlete not
later than one hour after completion of this final
event of the session or day or final event of his/her
championship.