Brazil's National Traffic Council, known as Contran, approved resolutions in June 2026 to implement pre-screening tests for alcohol and psychoactive substances.
This move expands the scope of the Lei Seca, a strict traffic law designed to reduce road fatalities. By integrating specialized equipment called drogômetros, authorities aim to identify drivers impaired by drugs, not just alcohol, to lower the rate of traffic accidents nationwide.
The new measures arrive as the Lei Seca completes 18 years [1]. While the law has long targeted drunk driving, the addition of drug-detection technology addresses a gap in enforcement. These pre-screening devices allow officers to quickly assess whether a driver has consumed prohibited substances before proceeding with more formal legal actions.
Contran's decision focuses on strengthening the existing legal framework to ensure safer roads. The implementation of these tests is intended to be nationwide, providing a standardized method for detecting impairment across different states.
Traffic authorities have highlighted the dangers of long-distance travel while impaired. For example, the distance between Campos dos Goytacazes and Nova Iguaçu is approximately 300 km [2]—a stretch where impaired driving poses a significant risk to public safety.
The use of drogômetros represents a shift toward a more comprehensive approach to sobriety on the road. These tools provide a first line of defense for law enforcement, allowing for rapid screening during routine checkpoints or following traffic incidents.
“Authorities aim to identify drivers impaired by drugs, not just alcohol.”
The integration of drug-screening technology into Brazil's traffic enforcement signals a transition from a narrow focus on alcohol to a broader mandate against all forms of chemical impairment. By updating the 18-year-old Lei Seca framework, the government is attempting to close a legal and technical loophole that previously made it difficult to prove drug impairment during roadside stops.
