Each patient's complete medicines history must be taken by a clinician and recorded at the start of care or as soon as possible, and current orders must be checked against it and the treatment plan with discrepancies resolved on arrival and whenever care changes hands. Allergy and adverse reaction history must be recorded at presentation, reactions that occur during care must go into the record and the incident system, and reactions must be reported to the national medicines regulator as it requires.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.