Americans have to decide if the benefits to humans of research using chimpanzees outweigh the ethical, financial and scientific costs.

The evidence is mounting that they do not. For one thing, many new techniques are cheaper, faster and more effective, including computer modeling and the testing of very small doses on human volunteers. In vitro methods now grow human cells and tissues for human biomedical studies, bypassing the need for whole animals.

Such advances have led to a drop in primate research. Many federally owned chimpanzees were bred to support AIDS research, but later proved inferior to more modern technologies. As a result, most of the 500 federally owned chimpanzees are idling in warehouses. Ending chimpanzee research and retiring the animals to sanctuaries would save taxpayers about $30 million a year.

We also know more about the consequences of invasive research on the animals themselves.