GRANT HARRINGTON / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY GRANT HARRINGTON / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY
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Drug contamination water tests. Chemist (left) and technician examining the results of tests carried out on river water, tap water, and sewage samples. The test here is the enzyme-linked immunosorbent assay (ELISA). This test checks for the presence of proteins such as antibodies and antigens, as well as allergens like pollen. Here, it is being used to test for the presence of the antibacterial drug triclosan.
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