California Code, Health and Safety Code - HSC § 112555

Any processor, prior to delivery to the consumer, shall quick-freeze all meat or meat products in a blast-type freezing room at zero degrees Fahrenheit with one side of the package exposed to circulated air, or in a still-air-type freezing room at a minimum of minus 10 degrees Fahrenheit with one surface side of each package in direct contact with coils of a freezing plate. This section shall not apply to the sale of retail cuts of meat sold over the counter.