摘要: The challenge in drug testing is to have a reliable, reproducible, and economical test that can be used make critical decisions about peoples’ lives. choice of which material often matter specimen accessible how people feel the sample obtained. Testing methods depend on whether laboratory equipment available well methodology holds up legal challenge. A concern expressed by some “any with less than 100% accuracy likely produce high percentage false positives” (1). To date, there no evidence this valid procedures currently place.