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St. Louis Calco, LLC, a sprout producer in Fenton, Missouri, manufactured mung bean and soybean sprout products under insanitary conditions, rendering them adulterated and potentially contaminated with filth or harmful substances. During FDA inspections in September 2023, investigators identified serious violations of the Produce Safety Regulation (21 CFR Part 112), including the company's failure to establish and implement a written environmental monitoring plan designed to detect Listeria species or Listeria monocytogenes in its growing, harvesting, packing, and holding environment. This represented a repeat violation, as the same deficiency had been observed during a previous inspection of the firm.