Originally Posted by
BubbaLoop
On the other hand, trace detection is designed to detect traces of dangerous chemicals, no matter where they are. Beginning on this premise and working on specificity and sensitivity is the proper approach to the problem at hand.
But this ignores the fact that
traces aren't dangerous: only the chemicals themselves are. Wider use of trace detection will cause yet more "false" positive (in quotes because the trace exists, but not enough to be a danger).