Abstract: Fecal and/or urinary contamination in meat and poultry can be detected by internalizing into a suitable livestock system a material containing a marker substance, and detecting for the presence or absence of the marker substance on meat values. Typically, the detection is carried out upon slaughter of the livestock and preparation of its meat values for consumption. As an illustration, a flour substance may be included in livestock feed, and, in turn, its presence or absence detected on the meat values under appropriate light conditions as an indicator of fecal contamination. For example, the flour substance may be flourescein, the presence or absence of which may be detected on the processed meat or poultry by ultraviolet light. A detection kiosk may be employed to assist in the detection.