Which Is NOT a Criticism of Drug Testing in the Work

Which is NOT a criticism of drug testing in the work place?

A) It may violate the constitutional rights of employees.
B) False positives and false negatives are always a possibility.
C) Any benefits of drug testing tend to be outweighed by the costliness of the procedure.
D) The most commonly used methods do not yield specifics about when the drug was taken or how much impairment occurred.