Tanker trucks arrive here at the processing center, loaded with raw milk from nearby dairies. Like giant Thermos® bottles on wheels, each one holds 5,300 gallons and keeps the milk chilled over many miles, no matter how hot the outside temperature gets. These trucks are licensed by the state and inspected regularly.

As soon as each tanker pulls in, samples are drawn from the milk inside. One is checked for temperature. If the temperature of the milk has risen beyond 44 degrees F, the entire load is discarded.