 He also argued that the tests were completely subjective.The Welsh Assembly refused to carry out a second test to confirm exposure to bacteria.According to a report by the Welsh Assembly, whether an animal is suffering from TB can only be shown by post-mortem examination or by microbiological analysis after death, but they say the test for exposure to the bacteria that cause the disease is 99.9% accurate and is recognized by the European Union and by the World Organisation for Animal Health.