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Establishing a large DNA data bank using the PowerPlex 1.1 and 2.1 systems.

¹Forsenic Biology Section, Virginia Division of Forensic Science, 700 North Fifth Street, Richmond, Virginia 23219, USA. Jban@dfs.state.va.usa

Croatian Medical Journal

|June 2, 2001

Summary

Virginia

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Area of Science:

Forensic Science
Genetics
Criminology

Background:

The Virginia Division of Forensic Science recognized the need for a DNA Data Bank in the early 1990s.
The data bank was intended for comparing convicted sex offender samples against unsolved cases to identify perpetrators.
Legislation expanded to include all convicted offenders and juveniles tried as adults for felonies.

Purpose of the Study:

To evaluate the effectiveness of the DNA Data Bank in aiding law enforcement.
To assess the impact of technological advancements and data bank expansion on crime-solving capabilities.

Main Methods:

Implementation of a DNA Data Bank for convicted offenders.
Transition from Restriction Fragment Length Polymorphism (RFLP) to Short Tandem Repeat (STR) DNA analysis technology.
Analysis of offender samples and forensic case samples for database matching.

Main Results:

The DNA Data Bank has significantly aided law enforcement in solving crimes.
An increase in offender sample analyses and unidentified suspect case analyses led to more DNA Data Bank hits.
By December 31, 2000, the hit rate improved to one hit per 700 samples, a substantial increase from one hit per 2,900 samples in 1997.

Conclusions:

The DNA Data Bank, particularly with the adoption of STR technology, has proven to be a valuable tool in criminal investigations.
The expansion of the data bank and increased sample analysis have demonstrably improved its efficacy in identifying perpetrators.

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