Metal could originate raw materials as well as equipment in manufacturing processes where metal parts could generate fragments due to the conditions of operation or damage to the equipment.
It is recommended that metal detection is used for processes prone to this.
In order to avoid routine use of metal detectors the company must demonstrate that it has identified and managed the risks such that the use of metal detectors for that particular process is not needed.
Cre: EU GMP guide part I: Basic requirements for medicinal products: Chapter 3: Equipment