The Department of Toxic Substances Control oversees or has some part in regulating everything from nail polish ingredients to oil refineries, radioactive waste to metal recycling in California. At the heart of our series is the story of a department that's divided, dysfunctional, and ineffective in fulfilling its mission to protect public health and the environment of the Golden State. We sifted through hundreds of pages of reports, memos, reviews, manifests and legal claims. We also analyzed thousands of records in the department's hazardous waste tracking system to find out that more than 40% of the hazardous waste manifests in the DTSC's database contain inaccurate information or are missing key details. Our reporting has held leaders accountable at the DTSC and compelled state lawmakers to call for an investigation of the department, including a legislative hearing this month (January 2014). Through a series of public records requests, we found out some of the department's top leaders were investing in companies the DTSC oversees. Our reporting into the potential financial conflicts of interest prompted an investigation into deputy director Odette Madriago by the California Fair Political Practices Commission (FPPC). Ms. Madriago resigned from her position six weeks after our report aired. The FPPC investigation remains ongoing.