the problems of conducting human tests. The primary threat posed water pollutants lies in their long- term, low-dose cumulative effects. Because humans live about 35 times longer than mice and have a far more variable genetic composition, high-dose animal exposure tests are no good for determining maximum exposure concentrations in humans.
Despite the lack of adequate testing techniques, says Sterrett, scien- tists must keep plodding along, taking care to continuously "review, re-evaluate,...