If a backflow prevention device is faulty and not yet repaired, any equipment connected to the facility's water supply must be clearly marked so it is not used while connected until the fault is fixed and the device has been tested as described in condition 31 (the cross-reference as printed; the device testing rule itself is condition 32, B32). This sits under the Part B heading for dealings with GM micro-organisms, so it applies in addition to the other conditions when any dealing in the facility involves them.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.