Record of Use of Listed Poisons : This should apply, to the substances that are locked in the poison cupboard, taking care that the same top and liner are in place. Your record should state the date, the substance withdrawn, the person responsible, for what it is required, the mass of substance used and your initials to denote that it was returned to the poisons cupboard. The mass of substance used is most easily determined by weighing the bottle when it is issued and again when it is returned. A book is most useful for recording these "before use" and "after use" masses and a specimen entry is shown in Table.

Table: Specimen entry in a Poisons Book