ABSTRACT The topic of the diploma thesis bears the title Possibilities of using technical means of narcotics checks in road traffic. The thesis endeavours to describe, compare and evaluate searching methods that are used in road checks for habit-forming drugs by public officials. The theoretical part is focused on the description of individual groups of habit-forming drugs and their effects on the human organism. Further, the theoretical part contains an overview of the most frequently used analytic methods. The practical part deals with the questions of detection aids used by the traffic police in the Czech Republic. Based on the methodology used, which included research in domestic and foreign sources and a structured interview, all the information obtained was thoroughly evaluated and it illustrates the substance of the topic. This diploma thesis is structured in such a way that enables its use by police units and other organisations that take part in fighting the use of habit-forming drugs. The thesis can be also a contribution for tuition as study material.