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Issues and main optimization directions of unsolved crime investigation over past years

This article discusses one of the topical issues of forensic science, namely: investigation of unsolved crimes over past years and the state of this activity. 
 The factors of such a situation and the social danger of the availability of array of unsolved crimes over past years are considered. 
 Based on the analysis of investigative practice, opinions of scientists and practitioners, the main issues of this activity are identified  and the main directions for its optimization are proposed in order to reduce the number of unsolved crimes over past years. 
 Positive influence of time factor on disclosure and investigation of criminal cases of this category is considered. Modern possibilities in the investigation of crimes over past years and directions of their use are demonstrated. 
 It is concluded that issue of disclosing and investigating unsolved crimes over past years is complex, therefore, its solution requires the same complex efforts.