If the test results are negative, can you be sure that the person did not take drugs?

No. There are several factors that can make the test results negative even though the person is using drugs.   Because

·          You may have tested for the wrong drugs.

·          You may not have tested the urine when it contained drugs.  It takes time for drugs to appear in the urine after a person takes them, and they do not stay in the urine indefinitely; you may have gotten the urine too soon or too late.

·          The person knowingly added something to the urine to prevent it from reacting with the test chemicals.

·          The chemicals in the test went bad because they were stored incorrectly or they passed their expiration date.

If you get a negative result, but still suspect drug abuse, you can test again at a later time. You should also consider testing other types of drugs. Talk to your doctor if you need more help deciding what steps to take next.

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