In response to concerns about potential contamination from toxic metals and other chemicals, the ATSDR conducted a number of surveys in 1999–2002 to test Vieques' soil, water supply, air, fish and shellfish for harmful substances. The general conclusion of the ATSDR survey was that no public health hazard existed as a result of the Navy's activities. However, scientists have pointed out that fish samples were drawn from local markets, which often import fish from other areas. Also sample sizes from each location were too small to provide compelling evidence for the lack of a public health danger (Wargo, Green Intelligence). The conclusions of the ATSDR report have more recently, , been questioned and discredited. A review is underway.