The Combined Surveillance and Monitoring of Seized Samples (CoSMoSS) is a joint project involving the ºÚÁϳԹÏÍø Police Force, ºÚÁϳԹÏÍø Ministry of Health and ºÚÁϳԹÏÍø Health Pathology Forensic and Analytical Science Service. The CoSMoSS project involves expanded routine analysis and reporting on a sample of street level drugs seized by ºÚÁϳԹÏÍø Police. This report outlines results from seized MDMA samples at music festivals.​