Tamama noticed that the woman’s blood tests were negative for alcohol. By itself, this was not proof she hadn’t been drinking. As the body metabolizes alcohol, it clears it from the blood faster than from urine. Then he looked at the results of tests for two byproducts or metabolites of alcohol: ethyl glucoronide and ethyl sulfate. If she had been drinking, they should have been in her urine. They weren’t. He also noticed that the patient had yeast in her urine. And she had uncontrolled diabetes, a sign that sugar levels in her urine would be high.