Biologists, under pressure from their employers, have adopted practices which lead to the underreporting of hazards to biological systems, especially as a consequence of agricultural and industrial chemicals and of radiation. There is little peer control of irresponsible genetic manipulation and introduction of exotic species by bioscientists. Zoologists have adopted questionable practices involving experiments of debatable value on large numbers of live animals. In many cases the pain caused has been considered as irrelevant. They are also intimately involved in the design of biochemical weapons systems, notably for defoliation, and in the design of addictive drugs.