Mershan got interested in prostate cancer, one of the most common cancers. He heard about work being done by a british researcher named claire guest. She had been training dogs to detect diseases similar to explosives. The pair ended up working together and floren was flown out for demonstration. Floren sniffed eight glass jars filled with urine from people known to have suffered from prostate cancer. If she detects what she believes is a positive sample, she's supposed to stop and stare at the jar before moving on.