Senatran requires Detrans to submit candidates for the first license to the exam; understand new rules and how to take the test
The National Traffic Secretariat (Senatran) sent an official guideline for the State Traffic Departments (Detrans) to immediately require the toxicological test for the first National Driver’s License CNH in categories A (motorcycle) and B (car).
The advance charge occurs even without the definitive technical regulation by the National Traffic Council (Contran). Senatran’s objective is to align the performance of local agencies and avoid conflicts of interpretation, since several states were still waiting for the adaptation of their electronic systems to the new federal legislation.
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The mandatory laboratory test for car and motorcycle drivers was provided for in the original text of Law No. 15,153/2025. Initially, the passage had been vetoed by President Luiz Inácio Lula da Silva with the justification of the financial impact on citizens, since the extra cost would make the qualification process more expensive and would harm free social programs.
Until then restricted to professional drivers in categories C, D and E, the toxicological test generates an additional cost that varies between R$ 90 and R$ 110 in the clinical analysis market. However, the National Congress overturned the presidential veto, making the measure gain the force of law immediately after its official publication.
Unlike what occurs with other stages of the training process, the lack of a report does not prevent the candidate from starting classes. The student can enroll, fulfill the theoretical and practical workload and take the traditional Detran exams normally.
Toxicology test criteria for CNH A and B:
The wide-window toxicological test used to obtain the CNH is a type of test that uses samples of hair, hair or nails in its analysis. Procedures made from blood and urine, for example, are not accepted in the process because they have a very short detection period and do not meet the requirements of the Law.
The objective is to verify the consumption, active or not, of psychoactive substances, with a minimum retrospective analysis of 90 (ninety) days.
In other words, the procedure can detect drugs consumed in the last three months from the date of sample collection. The tests are carried out in laboratories accredited by the National Traffic Secretariat (Senatran) for the detection of:
The toxicological test does not detect the consumption of energy drinks, antidepressants, alcohol, anabolic steroids, tranquilizers and the like.
After the drug is consumed, the bloodstream, skin oils, and perspiration are responsible for transporting the substances and depositing them in the keratin spread throughout the body. In the case of hair, as it develops, the substances are incorporated into the hair cortex and attach.
In approximately 6 days, the hair can come out of the roots and appear on the scalp. Thus, this new thread is already incorporated with illicit substances. If consumption is continuous, as the hair grows, the more the components of the drugs attach to the hair. In fact, this is the reason why it is possible to measure the level of consumption in the toxicological test.
In the case of body hair, the growth cycle is different from hair, since on the body, hair is programmed by the body to grow to a certain size. Even so, detection through body hair has the same effectiveness as locks of hair and depending on the laboratory they can analyze a retrospective of 180 days.
