<p>The article discusses the motivational aspects of professional and personal reliability of a specialist of law enforcement agencies. The peculiarities of the dynamics of his professional motivation in difficult situations are revealed. The ways of maintaining it at the level necessary for the performance of professional tasks are highlighted. The problem of controlling and increasing the motivation of a specialist as a professional is investigated, which makes it possible to effectively provide psychological support for a professionally significant motivational orientation. Theoretical analysis and experimental approbation of the problem solution are presented. The sub-components of the motivational factor in the course of a number of studies are justified: dispositional motivation; situational motivation; stable Self-image in the context of fulfilling professional duty; reflexivity of motives. The features of the resulting motivation dynamics are investigated, it is experimentally established that the dynamics of a specialist&rsquo;s motivation in various professional situations has its own patterns and is implemented in they are divided into the main four stages. In situations of practical activity, the motivational factor of professional and personal reliability, according to the authors, is constantly present at the background level. The main motivating component for actions to perform professional tasks directly in a situation is the presence of a rationalized professional dispositional motivation; awareness by a specialist of the professional and personal consequences of his actions; the ability to reflect, self-determination, that is, to arbitrarily activate internal situational motivation.</p>