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Drug Screening

Drug screening usually involves long-term monitoring of the target person's drug use. This means that various drug tests are regularly carried out to check whether there has really been a lasting change in drug use behaviour.

Categories Drug Screening

Drug screening usually involves long-term monitoring of the target person's drug use. This means that various drug tests are regularly carried out to check whether there has really been a lasting change in drug use behaviour.


The vast majority of cases involve cannabis degradation products, in connection with a drug test to regain a driver's license, a driver's license test or the more well-known MPU.

How does drug screening work?

If regular drug use is suspected, the driving licence office can order a drug screening or require a complete medical report with associated drug screening. Sometimes drug screenings are also carried out by order of a court, the public prosecutor's office, the employment office or the employer.

No matter by whom the drug screening is ordered, the procedure is always the same: During the screening period, the respondent repeatedly receives a letter or a telephone call stating that he must go to the laboratory for a drug test within a certain time window, usually a maximum of 36 hours. The time intervals are irregular and arbitrary, so that he cannot "prepare" himself for the drug test, i.e. cannot calculate with the decomposition time of the consumed substances.

In the laboratory, the first step is to determine whether the test person is really the person in question, after which the drug test is carried out. The urine sample is taken under the eyes of the laboratory technicians in order to make fraud impossible. It is then decanted into three sample containers: This produces the A, B and C samples. This division is necessary in order to maintain the significance of the drug test.

The three samples are then given a code and electronically archived. The A-sample is analysed, the B-sample remains closed for the time being, the C-sample is frozen. If the first sample is positive, the B sample is analysed by another person at another laboratory workstation using gas chromatography or mass spectrometry to verify the result.

Only if both results are positive is the overall result of the drug test positive and drug use confirmed.

Regular use in medium to high doses can also be detected in the urine of THC weeks later. Once you are in a position to undergo a drug screening, the only thing that helps is to stop using the drug.
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