When should a drug screen be performed in relation to a breath alcohol test?

A drug screen should be performed after the breath alcohol test to ensure that the results of both tests are not influenced by one another and to maintain the integrity of each test. Alcohol can be detected and analyzed relatively quickly, and conducting the breath alcohol test first allows for an immediate assessment of alcohol levels in the individual's system.

If a drug screen is performed before the breath alcohol test, there may be a risk of confusing results or the potential for the individual to alter their behavior based on the outcome of the previous test. Additionally, certain substances might affect the metabolism of alcohol in a way that could skew the results if both tests were given simultaneously or in the wrong order.

Thus, timing is essential in the testing process to ensure clear and accurate results for both the breath alcohol test and the drug screen. Performing the drug screen after the breath alcohol test maintains this clarity and adheres to established protocols for substance testing.