You mean like, read the student's application and use critical thinking to evaluate whether they're a good fit for the school based on their essays and individual accomplishments? Say it ain't so!
In other words, use subjective criteria that allow them to slip discrimination in under the radar.
When you admit as many students as a UC, you can easily run regressions to determine whether a particular admissions officer is being discriminatory. They should also be able to anonymize applicants pretty well.
They should be able to--that doesn't mean they want to know the answer. It's very obvious they want to discriminate but not be detected doing so. They're not going to run those regressions and they aren't going to anonymize.