Using Expert Systems (TrueAllele ® ) for Forensic STR DNA Analysis National Institute of Justice Grantees Meeting 2011 Using Expert Systems (TrueAllele.

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Presentation transcript:

Using Expert Systems (TrueAllele ® ) for Forensic STR DNA Analysis National Institute of Justice Grantees Meeting 2011 Using Expert Systems (TrueAllele ® ) for Forensic STR DNA Analysis Barry Duceman, PhD June 20, 2011 New York State Police Forensic Investigation Center

July 2007, Databank Forensic Scientists upload first batch of offender DNA profiles analyzed by TrueAllele ® Expert Review system. July 2004, Validation Study of the TrueAllele Automated Data Review System, Kadash, et al., Journal of Forensic Science

NYSP Forensic Investigation Center TrueAllele Production History

Expert system on-line Expert System On-Line

Enhanced staff productivity  Transferred staff to casework unit Enhanced data quality  85-90% DNA Profiles straight to CODIS Increased capacity and throughput  Target is 14 day turn-around

Software design features… Easy to use Convenient access to the data Provides a familiar “feel” Analyst formulates requests Allows analyst to challenge answers Entirely objective Standard statistical approach An expert system for DNA Casework

What does the software do? Infers genotypes Deconvolutes mixtures Displays mixing weights Establishes matches Assigns weights Provides reports TrueAllele for DNA Casework

TrueAllele for Casework Key Advantages Assured Objectivity Enhanced Productivity Increased Information

Study 1: Databank Concordance, Quality Assessment Study 2: Sexual Assaults Efficacy (Information), and Homicides Reproducibility Study 3: Property Crimes Sensitivity, Specificity, Ease of Use, Productivity VALIDATION CORE STUDIES TrueAllele for Casework

TrueAllele Preserves Mixture Identification Information Mixture Log(LR)

TrueAllele Preserves Mixture Identification Information (Validating TrueAllele DNA Mixture Interpretation, in print JFS 2011) TrueAllele CMP CLR CPI

human computer single source DNA mixture CASE Items per Category

Comparison with human review of STR DNA Data  For single source samples, computer provides comparable performance  For mixtures, computer provides more information The data supports using the software program for all of our DNA casework

What is the impact? Practically every aspect of lab’s operation will be affected Why? To accommodate the major advantages the program confers Information Retention Increased Productivity Guaranteed Objectivity

TASC Workstation Submitting Agency Report ControlsEvidence AUTOMATION Control Data Evidence Data RequestReport Request Report Request Sample WorkFlow Incorporating an Expert System Automation SUPERUSER DNA Analyst Evidence

Conclusion TrueAllele software offers Standardized results (within and between labs) Maximum information Unbiased reporting Faster turnaround.

ACKNOWLEDGEMENTS NYSP FORENSIC INVESTIGATION CENTER BIOLOGICAL SCIENCE SECTION CASEWORK UNITDNA DATABANK UNIT Russell GettigKristine Kadash Tim GobleTom Leach Melissa PembertonBrian Kozlowski Mallory GageMichelle Adams Lisa Biega CYBERGENETICS Mark PerlinCE Spencer Matt LeglerJL Smith Bill Allan NERFI Jamie Belrose Supported by Funding from the National Institute of Justice