Drug testing has been a part of background checks for a long time. Marijuana contains THC, which is what the test will generally show when looking for marijuana use. Typically, drivers, individuals needing a security clearance, industrial machine workers and few other fields or entire industries were known for drug testing, and expected. With the recent surge of Marijuana availability in certain parts of the U.S., drug testing for THC seems inevitably more widespread. There are a few commonly asked questions regarding employers which conduct background checks. Which companies are testing for Marijuana? How do I know if something will show up in my test results? What if I'm on medication which I don't want to disclose? Many of these questions are asking what the law is and how it affects each individual situation. In my opinion, open forums are not a go to place for legal advice, but a discussion about experiences and possible helpful tips regarding a specific subject. An issue to remember is that while possessing Marijuana may be legal in two states, Washington and Colorado, and other states which have legalized its medical use, federal laws have not changed and can still penalize you. Although no one is worried about being arrested for THC found in their employment drug test, it raises a question of whether the individual's job prospects are jeopardized. How do you know whether you will not be hired by an employer due to your drug test results? As a first step, a prospective employee can get educated about the subject. Many applicants simply don't do their due diligence and research the topic enough before jumping into the job market, maybe from being eager and applying for open positions that have come up. Services conducting lab tests for drugs hired by employers often advertise their services online and everyone to see. Which drugs to they look for, how accurate are they and more. This way you know what you're dealing with and how far have these these come along with technological advancements. Research the company, not just on their website, but in the news also, everything and anything about their work force. Some companies only drug test certain positions, others are testing everyone. There's also the issue of the company's culture or environment, some are less tolerant than others. Drug testing has become cheaper for employers due to its development and popularity, many can be found advertising their services by simply browsing the net. You will be able to see how to request a urinalysis and maybe even run one on yourself. In regard to background checks, a good tip is to run one on yourself to see what others can see as well. However, it does not eliminate the fact that you may not be the right fit for that job due to your medication or drug use. Ask about the side effects when it comes to operating machinery and other specific tasks you will be responsible for from the prescribing doctor. There is a lot of research to be done before answering these questions on your own. You can take people's advice, but how reliable will that be is subjective. Research what it takes for medications to appear versus Marijuana? How much does it take? How long do the effects last if you're a one time user? How does Marijuana impair your thinking in an office environment as well as your motor skills. Spend the necessary time and effort looking up credible sources and see what you will be exposed to in your individual case. Even go as far as putting yourself in the employers shoes.