A system for testing for contaminants in an assembly line grow pod includes a tray moving along a track arranged in an assembly line grow pod, a plurality of cells arranged on the tray and a contaminant sensor. Each cell supports seeds, plants, or both, and a selected cell includes side walls and a base that define a cavity. The contaminant sensor is arranged in the cavity of the selected cell. The contaminant sensor includes a sensing device and a control device. The sensing device directly senses a characteristic of a content present in association with the selected cell. The control device is coupled to the sensing device and operable to receive a signal from the sensing device. The control device may determine a likelihood of contamination based on the received signal.
