This paper briefly explains the technology of RFID chip implants; explores current applications; and considers legal, ethical, health, and security issues relating to their potential use in the workplace. Compulsory use would be likely to encounter legal and ethical challenges. Even voluntary use might be subject to challenges, for example, on data protection grounds. It seems that the risks of adverse health effects in humans might be considerably less than some have suggested, although they cannot be entirely discounted without better evidence. Contrarily, although there are indications of improvements in recent years, the benefits in terms of enhanced security might not be deliverable with the vulnerability of current RFID chip technology. This document was prepared by Milieu/IOM Ltd at the request of the Committee on Employment and Social Affairs of the European Parliament.