A majority of the Fortune 500 Companies implement some practice of workplace drug testing in their company policies. This practice was first initiated by President Ronald Reagan when he ordered federal agencies to drug test federal...

Herbal supplements are available without prescription in many countries throughout the world and accounting for over $30 billion U.S dollar in sale. A majority of U.S population (25-40%) use herbal supplements while alternative medicines...

Written in a handbook style with specific methods and tips on eliminating false positive and false negative results, this book is a practical guide to the detailed mechanisms of such occurrences. von Dasgupta, Amitava