– NEW ProCon.org Website! – Should Animals Be Used for Scientific or Commercial Testing? – An estimated 26 million animals are used every year in the United States for scientific and commercial testing. Proponents say that animal testing has enabled the development of many life-saving treatments for both humans and animals and that there is no alternative method for researching a complete living organism. Opponents of animal testing say that it is cruel and inhumane to experiment on animals and that animals are so different from human beings that it often yields irrelevant results. ProCon.org’s 49th website explores the pros and cons in the debate over animal testing.