Surveillance of methods for collection of raw milk samples and their transmittal to laboratories is essential to the interpretation of laboratory results for official grading purposes. At least 15,000 farm bulk tank truck drivers collect milk samples each day. The accuracy of thermometers and sanitization and/or sterilization of sample transfer instruments, agitators, and containers is important. Agitation of milk, collection of temperature controls and samples, and storage in insulated sample cases, containing a suitable refrigerant during transmittal to the laboratory, are necessary critical operations in collection of representative samples. Accurate records indicating time, date, and temperature at collection must accompany each series of samples. Samples must arrive at the laboratory between 32–40 F (0–4.4 C) and examinations should begin within 36 h after collection. Surveillance of sample collectors is done at least biennially by Food and Drug Administration (FDA) approved State milk sampling evaluation officers who have met FDA criteria for certification.