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The notion of “trace” has a special significance in forensic science. Analysis of the trace pattern allows you to obtain information about the identity and actions of the offender. Scientists have developed many classifications of tracks on various grounds. Depending on the conditions for obtaining information about the crime, the author identifies three groups of tracks. Materially fixed traces are available for direct perception by all participants in the proceedings. Signed traces for direct perception are not available, but can be studied independently of the will of the participants in the criminal process. Ideal traces are not only inaccessible to direct perception, their study is impossible without the consent and participation of a person - “bearer” of these tracks.
A Tue, study studied this question.