Quick DNA testing.... http://www.sciencedaily.com/releases/2010/08/100804122715.htm
Interesting article: However, it doesn't appear that the 4 hour test capability is generally available. Not to say that the .gov doesn't have it but in my experience .gov is not known to adopt new technologies all that quickly.
Even if the .gov has the capability the test would take 4 hours plus the time necessary to get OBL's sample to the test site.
Timeline is still a bit shaky.