11. Delivery to messengers
A person shall not deliver any of the drugs to which these Regulations apply to any person not licensed or otherwise authorised to be in possession of the drugs who purports to be sent by or on behalf of a person so licensed or authorised unless such person produces an authority in writing, signed by the person so licensed or authorised, to receive the drug on his or her behalf and unless the person supplying the drug is satisfied that the authority is genuine.