As an employee of the human resource department of a major corporation, you are concerned about the potential costs of drug abuse. You are contemplating testing employees for substance abuse. Before adopting such tests, you should know that: A. this type of testing has been found to be illegal, but many firms do it anyway. B. medical tests of this nature are not very accurate. C. if you use these tests, your company will join over 70 percent of major companies that test workers and job applicants. D. these tests are very expensive, and should only be given to those who may belong to