Drug usage in the workplace costs employers incredible amounts of money each year. Drug testing potential employees has become so prevalent that drug users are finding it extremely hard to find jobs Drug tests, however, are not completely reliable. The most common test used to detect drugs is approximately 98% accurate. To decrease the likelihood of making an error all potential employees are screened through two tests, which are independent, and each has 99% accuracy If a potential employee were a drug user, what is the probability that the person would fail the first test and pass the second test