I don't think that your only options after interview will be waitlist or reject. The UCs are kind of behind. I just spoke with UCSF recently and they haven't even accepted 100 people yet and told me that acceptances would be sent out in march, april, and may. I was told that if you are offerred an interview then you have a chance at being outright accepted. What those chances are?? i don't know. UCLA sent me a secondary in January and rejected my ass in March. For me, it was money down the toilet. If you really wanted to go to UCLA, I don' think you would have posted this thread. If you aren't really interested in going there, don't fill out the secondary..but if you are, send it in. They screen for their secondaries so they obviously think you are competitive numerically and want to take a look at your essays and letters. I wish you the best in whatever you decide.