Yes. It is acceptable to check staged materials prior to and after processing as a method of checks for
addition through verification of empty containers.
The preferred method for conducting addition checks is by direct observation by the verifier. The verification
of empty containers is an acceptable alternative, but only where stringent controls exist regarding the
handling of dispensed raw materials.
Such controls include:
- assurance that a dispensed raw material does not end up in the wrong batch; locked portable cages are being
used by some firms and only pertinent cages are permitted in the room at the same time. - adequate operator awareness, training and motivation; the operator has to assure that additions are performed
in the proper sequence; any spillage of raw materials must be promptly reported. - pre and post checking should be performed by qualified personnel and whenever possible should be the
same person. - the post processing check must be performed prior to removal of any material from the area.
