Please note that all staff visiting from other agencies, whether local authority or NHS, will have been required to undergo an enhanced Disclosure and Barring Service (DBS) check as part of recruitment. This is a given, so proof of their employment and role is also evidence of compliance. However, you can ask for confirmation of their DBS status from their employer if required e.g. via a letter from their organisation. It is not normal practice for visiting staff to carry their DBS certificates with them or to provide copies.