Sourcing the data To analyze how companies use confidential business information (CBI) claims in chemical reporting, C&EN turned to Chemical Data Reporting (CDR) data under the Toxic Substances Control Act (TSCA). C&EN downloaded CDR reports from 2016, 2020, and 2024. Companies file the reports every year, but the US Environmental Protection Agency releases the reports only every 4 years. For example, the 2024 report contains chemical reporting data for 2020, 2021, 2022, and 2023.