From about 1993 or 1994, for every temporary agency, temp job, or permanent job I had, I was drug tested. While I was an "office worker," I worked for a wide variety of corporations, including as a secretary to the financial VP of a company that incinerated stuff to a plant manager for FDA regulated company to documentation and/or training for an FDA regulated company. Not only does the temp agency give you a drug test, but in some cases, so does the company where you'll be working. The FDA regulated companies drug tested everyone when starting followed by random drug tests at any time and for as many years as you worked for them. I heard that if you failed a drug test, it was instant termination. Drug testing is extemely common and definitely not worth risking your job.