The control of pesticides, as of all synthetic chemicals, in most industrialized countries relies heavily or even entirely on safety data supplied by the manufacturers. Such a regulatory system can only be effective if the companies conducting and reporting the studies honestly disclose any adverse findings. The record shows, however, that all too often company executives and their scientists knowingly suppress or manipulate information that could affect the licensing and sale of their products. A case in point is the gross manipulation of health and related data on the pesticides heptachlor and chlordane by the U.S. chemical company, Velsicol.
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