Isoray is on the Cruelty Free Investing list for exploiting animals because the company does animal testing for some of their medical analysis and clinical research.
In this report to the SEC, the company specifically mentions:
Pre-Clinical Testing. We are presently engaged in this phase, in which animal experimentation is conducted to generate test results to verify the design against its "product (user) requirements" and to identify the hazards of its use in a risk analysis."
IsoRay designs and develops innovative and personalized brachytherapy products that treat many forms of cancer.