Ian went pale and shook his head. "It can't be."

"That's a definite positive result," Dr Taylor said, sitting back down at his desk.

"No, I mean..." Ian paused, trying to think how to phrase it. "We had pills. We were within the six to eighteen hour limit." He was beginning to have the horrible realisation that they could be placebos. They hadn't got them from official sources, so they could have been sold anything and he hadn't thought to test any of them to check.