Doesn't always work that way my college specifically states that your pretty much good as long as you keep it under 5in blade and of course no switchblades, dirks, daggers, fixed blades, etc. Says so in the school rules itself. Quite a few of the students carry knives, especially those in the fire and medical programs at the school and quite a few of them are over the 2.5in and it's not like we hide this from the staff. Heck we have had a teacher tell us and expect us to carry knives in the fire program, that teacher even ripped the 2 guys in the class a new one when he found out they didn't carry a knife as he felt they were ill prepared (not a rule for us to carry but a random question to us before telling us to always carry a knife).
From reading through your link, you seem to be mixing things up it seems to be applying to
fixed blades.
from section B: "
fixed blade longer than 21/2 inches upon the grounds of, or within, any private university, the University of California, the California State University, or the California Community Colleges is guilty of a public offense"
Section (A)(1) and (2) concern grades 1-12, not college. Section (B) is where it applies to college which it states that it is for fixed blades. Than the rest goes onto exceptions and a few other things.
http://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PEN§ionNum=626.10