Evidence is preserved in case it is needed for legal proceedings, using write blockers, master and working images, procedures agreed with legal staff and law enforcement, and chain of custody forms recording identifiers, handlers, times with time zone and storage locations. Staff are competent in the four principles of the ACPO good practice guide for digital evidence, and systems are forensically imaged before rebuild, by in-house or third-party capability.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.