This report (The Control of Bovine Tuberculosis in Northern Ireland) by the Northern Ireland Audit Office reveal just how unreliable the skin test can be and also refers to fraud.
Bovine TB testing procedures (Part 2 of the Report)
• the limitations of the Bovine TB Skin Test in detecting infected animals
• the cost of testing carried out by Private Veterinary Practitioners (PVPs)
• the quality of work being carried out by a number of PVPs • Departmental supervision of PVP testing
• disciplinary action against PVPs who breach procedures