“a sample that way.” Isobel jumped up and started pacing as well. “Maybe, but what about the other DNA on the cup – the waitress’s?” “How could we make sure that the cup is as clear as possible of other DNA?” Isobel stopped. “I have an idea. Peter, has Anne Banks observed you eating or drinking anything?” “No. Why is that important?” “You could pretend to the waitress that you have an allergy to milk. Then you ask her to wear gloves as you’re very allergic – and the cup should come straight out of the dishwasher. And in case the cups should somehow get mixed up, the lady’s cup should be given the same treatment – dishwasher, gloves.” Peter shook his head. “You have an answer for everything.”