This is from a good source from ucsf.
In order to get a secondary, your gpa (science and nonscience), school competitiveness, instate residency, mcat, and personal statement are numerically ranked. If it passes their pre-assigned cutoff you get a secondary.
In order to get an interview your LOR's and 'maturity' are numerically evaluated. They add this to the previous number and if it passes their cutoff, you get an interview.
UCSF has two interviews. Each interviewer writes and evaluation, after which a numerical value is determined (1 to 4) for both interviewers. You need to average a 3.5, in other words. Both numbers must add up to 7 or above if you are to be considered for an outright acceptance.
Then, it becomes the whole application again. 1/3numbers, 1/3 LOR's and statement, and 1/3 interview (or something like that...this is where it gets mysterious).
Anyway..I know plenty of people at UCSF who got under a 33 on the mcat and are white. I don't think it is as black and white as some people make it seem. Each UC does their system a bit differently. I got rejected presecondary from Davis and preinterview from ucsd (hold) and ucla, but got interviews at UCSF and UCI. When I try to rationalize it, I get really confused...They do look for diversity (which takes into consideration your ethnicity) but I don't think that means that caucasians and asians need a 35 or greater to have a shot. If so, I am screwed
By the way, I'm waitlisted at UCI and awaiting a postinterview response from UCSF. I got a 32R on the mcat, and am a nontrad applicant (with no gold medals, no 4.0, i wasn't in a rock band, and i didn't start my own dotcom).