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How a urine test works todayIn the 1970s, drug tests were performed using "dip sticks." They were little cardboard sticks coated with a chemical that would react with whatever you were testing for. If you were testing for Diabetes, you'd use a stick that would react to sugar in urine. If there is any sugar in the urine, the dipstick will change color.

The neat thing about dipstick testing for illegal drugs is you can fool the sticks easily enough...a little salt, too much water, what have you.

These days, they use "GC/MS" drug testing. It means "gas chromatigraph/mass spectrometer." It is a computer-driven instrument that can screen for just about anything you want. You cannot fool the GC/MS because it knows what chemicals are in, say, THC, and it will detect those chemicals in the presence of adulterating agents.

URINE TESTIF YOU MEAN A NEGATIVE reading for drugs, the answer is NO. They check your urine for more than just drugs. They check the temperature of it, creatinine, and other chemicals to make sure that you haven't tried to dilute or otherwise mess with the sample. The only way to get a negative reading is to not use any drugs for at least 4 days before the test (5 weeks for marijuana). Some people try to drink tons of waterfor 2 days before the test, to try and "flush" out their system. HOWEVER, if you do that, they can tell that the urine is diluted, and that's an INSTANT FAIL. Stay off all drugs (unless they are legally prescribed by a doctor), and you will pass. They check for EVERYTHING: cocaine, marijuana, narcotic pain pills, speed, heroin, tranquilizers, EVERYTHING. Nowadays, it's very difficult to fool a urine test. Good Luck! <<>>
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Q: Will adding table salt to a urine sample give a negative reading in a drug test?
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