We strictly adhere to Toxicity Characteristic Leaching Procedure (TCLP) testing of our photovoltaic module portfolio to monitor the presence of any toxic metal substances (arsenic, barium, cadmium, chromium, lead, mercury, selenium, silver) according to TCLP Standard EPA Test Method U.S. Environmental Protection Agency (EPA) under the Toxic Substances Control Act (TSCA) for landfill disposal of modules.