Earlier this month, the Food and Drug Administration (“FDA” or “the Agency”) issued a highly anticipated proposed rule outlining the regulatory framework and implementation plan for Laboratory Developed Tests (“LDTs”).[1] The history of LDT regulatory status is long and meandering—and summarized below—but in short, FDA has for a long time exercised enforcement discretion over LDTs.Continue Reading FDA’s Proposed Rule on LDT Regulation and the Debate over Agency Deference