20.1 All donated milk is identified as relating to a specific approved milk donor. Donated milk is packaged securely with identification visible, and maintained in a frozen state until chosen for processing. Logging of incoming milk includes estimating the volume of milk, as well as observing for foreign matter or other sources of contamination such as broken storage containers. Milk is discarded if contamination is suspected or if foreign matter is present and unable to be extracted without contamination.