Many people often wonder what drugs are tested for by employers or rehab facilities. There are 5 standard substances that are always tested for. Those include marijuana, cocaine, amphetamines, opiates, and PCP. However, because of the growing problem with prescription drugs, these are tested for now. The prescription drugs that are tested for include but are not limited to Oxycodone, Valium, Xanax, Barbiturates and GHB–the compound found in date rape drugs.
Many also wonder if it is possible to pass a drug test when you have been using. The answer to this is that it is very unlikely. Stocking your body up on certain herbs, specific foods, detoxifiers, coffee or anything else won’t trick the test. And the companies that perform these tests are well aware of all things people use to try to "beat the test." Few know they have the option to conduct specimen-validity tests to ensure the specimen was untainted and they do quite often as many people try to change the results.
The only way to pass a drug test it to not use drugs. Only time and not using drugs will clear your system.

Actually, it is possible to beat drug tests by drinking lots and lots of Cranberry Juice. Cranberry Juice cleanses out your system, however some employers or rehab facilities give you creatine tests to determine whether or not you’ve been drinking Cranberry Juice because it lowers your creatine level to about 6 or 7.
My employer sent my urine off to the lab for drug testing… i had been using and loaded up on water, the test came back as ‘bad speciman’. they sent me back for a second test and i had used heavily the night before.. again i loaded up on water and took the test and never heard a word back from them.. my theory is…… drink as much water as possible!!!! it works!!!
You were very lucky to get off that easy. Drinking water does help flush impurities out of your system, but it doesn’t completely remove them or guarantee that you test clean. Really, the only way to guarantee that you’ll pass the test is to just not use. Then you don’t have to worry.
how long does it take suboxone not to show up in your urine?