Citation URL: http://www.urban.org/CarlyKnight

The study compared traditional crime solving to biological evidence techniques in hundreds of cases where biological evidence was available. When conventional investigative techniques were used, a suspect was identified 12 percent of the time, compared to 31 percent of the cases using DNA evidence. In eight percent of cases built on traditional evidence alone a suspect was arrested, compared to the 16 percent arrest rate in DNA cases. The average added cost for processing a single case with DNA evidence was about $1,397. Each additional arrest-an arrest that would not have occurred without DNA processing-cost $14,169.

This study assesses the death penalty's costs to Maryland taxpayers by examining a sample of the 1,136 death-eligible murder cases occurring between 1978 and 1999. We find that an average capital-eligible case in which prosecutors did not seek the death penalty will cost approximately $1.1 million over the lifetime of the case. A capital-eligible case in which prosecutors unsuccessfully sought the death penalty will cost $1.8 million and a capital-eligible case resulting in a death sentence will cost approximately $3 million. In total, we forecast that the lifetime costs to Maryland taxpayers of these capitally-prosecuted cases will be $186 million.

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