Homicide investigation operated in an evidentiary environment far richer than that available to earlier generations of detectives, yet improved forensic visibility did not restore historically high clearance levels. This article examined that mismatch as a problem of conversion rather than a failure of forensic science. Drawing on peer-reviewed journal articles published between 2020 and 2026, together with selected foundational studies on homicide solvability and investigative workload, the analysis distinguished technical capacity from case-conversion capacity. It developed evidence convertibility as the central mechanism: the extent to which an available trace reduced uncertainty about offender attribution soon enough to alter investigative action. DNA profiles, video, ballistic links, digital records, and witness statements could be accurate while remaining operationally weak when they could not be connected to a person, interpreted within a relationship, integrated across units, or acted upon in time. The analysis therefore located the solvability gap in the distance between what an investigative system could detect and what it could convert into an attributable case. Solvability was partly inherited from the homicide, but investigative decisions could preserve, enlarge, or erode it.
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