Case Management Issues from Crime Scene to Court Room.

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Presentation transcript:

Case Management Issues from Crime Scene to Court Room

Anne Arundel County Police Department, Maryland Population: 510,000 Size : 600 square miles PD: 700 sworn 250 civilian

Case Management Issues from Crime Scene to Court Room Crime statistics: 15 murders 100 rapes 2,500 Part 1 Violent Crimes 15,000 Part 1 Property Crimes

Case Management Issues from Crime Scene to Court Room Organization Crime Lab – CDS analysis Serology/DNA Identification Unit - Crime Scene Unit Evidence Coordinators Latent print Photo lab

Case Management Issues from Crime Scene to Court Room “To trace, or not to trace……….” Evidence coordinators make decision based upon: -Type of physical evidence collected -Suspect or no suspect -Suspect in custody -If no suspect, initial emphasis on evidence with databases (DNA & fingerprints) Identification v. case enhancement Relationships Pandora’s box

Case Management Issues from Crime Scene to Court Room Most probative results: Trace considered during initial laboratory screening - equal footing with serology/DNA Least probative results: Trace analyses considered secondarily or as a “last resort” Trace evidence since 1985: early 90’s MSP & FBI Labs mid 90’s - our own Trace Unit Currently - outsourcing

How is trace evidence viewed in our system? Prosecutors -Preferred trace evidence -Moved towards DNA -Juries expectations shift emphasis back to trace -Hair comparison with mtDNA Juries -Can’t get enough! -If you collected it, why didn’t you analyze it? Crime Lab -Emphasis on DNA -No plans to bring back trace examiner position Investigators -Prefer database-type evidence -Greater emphasis on forensic sciences

Scenario #1: A murder Female victim found on the shoulder of a highway Ligature strangulation Partially clothed with possible sexual assault Autopsy Examinations Visible exam Sexual Assault Kit Head and pubic hair combings Fingernail scrapings Collect standards Collect clothing Collect sheet for trace Scene Examinations (a.k.a. - whatever we can get away with) Search body w/UV and ALS Collection of extraneous hairs/fibers Latents from body Trace evidence vacuum Inkless fingerprints/ fingernail scrapings Wrap body in sheet Soil/vegetation standards

Scenario #1: A murder Female victim found on the shoulder of a highway Ligature strangulation Partially clothed with possible sexual assault Laboratory submissions Sexual assault kit and clothing to Serology/DNA Combings and any extraneous collections/vacuumings directly to Trace with victim’s standards Trace Examinations Investigative - initial examinations to identify hairs/fibers foreign to victim that may establish perimortem environment Comparative – eventual examination with knowns/unknowns from suspect(s)

Scenario #2: Vehicle recovered from a carjacking two male subjects fitting the description of the carjackers used the vehicle during an armed robbery of retail establishment 1 hour later Vehicle examinations Usual search and processing for physical evidence Collect hairs/fibers individually or vacuum GSR collections, if appropriate Latent prints interior/exterior surfaces (swab steering wheel- DNA) Collect standards Suspects - collection of knowns/unknowns

Conclusions More comprehensive training of Serology / DNA analysts Shift back to the collection and analysis of trace evidence, driven by: -Jury expectations -Realization that there ARE limitations to DNA -Hair comparisons confirmed with mtDNA -Technological advances