This Technical Bulletin No. 37 provides guidance on the implementation of BS 8517-2:2016, the updated British Standard Code of Practice for the use of detection dogs, which supersedes the previous version from 2010. The document outlines mandatory compliance requirements for NSI-approved companies providing detection dog services, including timelines for existing and applicant companies to meet the new standards. Key updates include changes in terminology, enhanced welfare and training requirements, and specific operational guidelines to ensure the effective and safe use of detection dogs. Manual review is recommended for complete details, as the document contains extensive technical specifications and changes.