[justin66]

> However, this man set off a bomb detector. He set of the machine that detects bombs, repeatedly.

It detects a lot more than bombs. Over the machine's lifetime it will detect hundreds of thousands of things but almost certainly not any bombs.

[late2part]

Hear hear! This is a chemical detector, not a bomb detector.

http://math.stackexchange.com/questions/225047/estimate-conf...