Metal detectors are considered under building equipment. Therefore, the requirements for building equipment in Section 8 (Equipment) would apply, specifically Section 8.1 (Purchasing, Receiving and Installation) and 8.2 (Use, Cleaning, Maintenance, Repair and Installation). The requirements in Section 8.3 (Calibration) do NOT apply; although metal detectors may be used as a food safety mitigation measure, they are not specifically required by the program.
On the audit checklist, metal detection equipment would be considered in the sections relevant to building equipment.