- Drug tests must have boundaries on what they are testing for. While a drug test might examine for the main drugs the school might believe students are taking, students can have negative result, even if they are taking those illegal drugs. The tests have set restrictions for the drugs they test for, which implies that if the drug is not one being tested, the student will come up negative. As an outcome, it is useless at finding all of the students who might be at great threat.
- A student can drink water to make the drugs in their system invisible by the test. Two liters of water will water down the drug so it is not identified by a drug test. This means that there will be higher probabilities that accurate findings will not be detected.
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