Here is the law concerning the favorite charge for students around SDSU Minor in Consumption;
Minor being defined as any person under the age of 21, and consumption meaning measurable BAC of >.01 though the police can just make a determination based of no measure.
People under the age of 21 need to be aware that the police will just assume you have been consuming alcohol if you are at a party, and they will issue a citation. If you were not breathalyzer you should fight this charge to protect your record, your university status and your wallet.
SDMC 56.61 Minor consuming alcohol in public
(Infraction) Fine of $435 [No probation, fine is sentence]
SDMC 56.61 Minor consuming alcohol in public
(Infraction) with one prior fine of $815 [No probation, fine is sentence]
Source http://www.sdcourt.ca.gov/pls/portal/docs/PAGE/SDCOURT/CRIMINAL2/CRIMINALRESOURCES/COURTROOM%20COUNSEL%20COPY%20010109%20FINAL%20WO%20WARNING.PDF