On this morning on wed I think it was, they did a bit about cancer sniffing dogs and diabetes alerting dogs. Was interesting the filmed the indications earlier on the show so less noise and lights ect, the cancer dog had a brill indication, he sniffs i think it was 5ml samples of urine and lays next to iy with head on pot till handler approaches. They were saying how they used one sample that someone had had cancer as a negitive but the dog kept indicating on it, turned out the cancer had returned to another part of his body, and interesting the dog is better at indication early stages when the cancer gets large the dog no longer indicates on it!