Consider a draconian zero-tolerance drug policy in an office place, where they can demand a piss test at will. Does "zero tolerance" imply that they will disre

Consider a draconian zero-tolerance drug policy in an office place, where they can demand a piss test at will. Does "zero tolerance" imply that they will disregard all standard laboratory procedures, disregard the margin of error on the tests, and fire you even if the lab tech points out that the test technically returned a negative since the result was below the margin of error? No, "zero tolerance" isn't, literally interpreted, a statement about how the test will be executed. It is a statement about what happens after the test returns a positive. Of course in practice "zero tolerance" means "we are going to do whatever the hell we want, and then wash our hands of responsibility". That is how "zero tolerance for guns" can turn into "nail this kid to the wall for eating a poptart".