Organisations invited to participate in the Delphi study and outcomes of those invitations
| Sector | Organisation | Outcome |
| Police | National Police Chiefs’ Council | Participated |
| Judicial/coronial | Coroners’ Society | Declined (due to perceived implications for court process) |
| Office of the Chief Coroner | Email acknowledged, but no participants entered | |
| Royal College of Pathologists | Email acknowledged, but no participants entered | |
| Custodial | Faculty of Forensic and Legal Medicine | Participated |
| UK Association of Forensic Nurses and Paramedics | Participated | |
| Ambulance care | Association of Ambulance Chief Executives | Participated |
| Emergency care | Faculty of Intensive Care Medicine | Participated |
| Royal College of Emergency Medicine | Participated | |
| Mental health | Royal College of Psychiatrists | Participated |
| Mind (advocacy group) | Declined (due to lack of relevant expertise) | |
| Toxicology | National Poisons Information Service | Participated |
| European Network of People who Use Drugs (advocacy group) | No acknowledgement of attempts to contact |