The Dorset Biological Warfare Experiments were a series of experiments conducted between 1953 and 1975 to determine the extent to which a single ship or aircraft could dispense biological warfare agents over the United Kingdom. They were conducted by scientists from Porton Down, initially using Zinc cadmium sulfide (ZnCds) as a simulated agent. Early results clearly showed that one aircraft flying along the coast while spraying its agent could contaminate a target over 100 miles away, over an area of 10,000 square miles. This method of Biological warfare attack and the test program to study it was known as the Large Area Coverage (LAC) concept.