Understanding Case Connectivity: How Testing SAKs Can Link ...€¦ · Understanding Case...
Transcript of Understanding Case Connectivity: How Testing SAKs Can Link ...€¦ · Understanding Case...
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Understanding Case Connectivity: How Testing SAKs Can Link Criminal Cases
Presented by Rebecca Campbell, Ph.D. & Rachael Goodman-Williams, M.A.
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This project was supported by Grant No. 2015-AK-BX-K021
awarded by the Bureau of Justice Assistance. The Bureau of
Justice Assistance is a component of the Department of
Justice's Office of Justice Programs, which also includes the
Bureau of Justice Statistics, the National Institute of Justice,
the Office of Juvenile Justice and Delinquency Prevention,
the Office for Victims of Crime, and the SMART Office.
Points of view or opinions in this document are those of the
author and do not necessarily represent the official position
or policies of the U.S. Department of Justice.
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Webinar Goals
Explain the potential utility of case connectivity and provide
step-by-step instructions about how DNA testing information
can be interpreted and analyzed to establish case connectivity
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OverviewCase Connectivity = Linking Or Connecting Crimes Committed By The Same Perpetrator
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How Do You Establish Case Connectivity?
Case 1 Case 2
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How Do You Establish Case Connectivity?
Case 1 Case 2
Evidence that the same perpetrator committed
both crimes
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How Do You Establish Case Connectivity?
Case 1 Case 2
Could be witness reports, confession,
offender MO, or DNA
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Establishing Case Connectivity Through CODIS
Forensic Sample 1
Forensic Sample 2
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Establishing Case Connectivity Through CODIS
Forensic Sample 1
Forensic Sample 2
Matching DNA Profile
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Establishing Case Connectivity Through CODIS
CODISOffender Index:
Contains DNA profiles from arrestees and/or convicted offenders
Forensic Index:
Contains DNA profiles found at crime scenes, including in SAKs
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Establishing Case Connectivity Through CODIS
CODISOffender Index:
“Qualifying offense”
Forensic Index:
“Crime scene offense type”
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Establishing Case Connectivity Through CODIS
Offender Index# Offender ID Burglary# Offender ID Sexual
Assault# Offender ID Controlled
Substance# Offender ID Felony
Weapons# Offender ID Homicide
Forensic Index# Blood Burglary# Semen Sexual
Assault# Semen Sexual
Assault# Semen Sexual
Assault# Blood Homicide
Qualifying Offense
Crime Scene Offense Type
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Establishing Case Connectivity Through CODIS
Offender Index# Offender ID Burglary# Offender ID Sexual
Assault# Offender ID Controlled
Substance# Offender ID Felony
Weapons# Offender ID Homicide
Forensic Index# Blood Burglary# Semen Sexual
Assault# Semen Sexual
Assault# Semen Sexual
Assault# Blood Homicide
Indication of Serial Sexual Offending
Indication of Serial Sexual Offending
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Information about Perpetrator Identity
Offender Index# Offender ID Burglary# Offender ID Sexual
Assault# Offender ID Controlled
Substance# Offender ID Felony
Weapons# Offender ID Homicide
If DNA from a SAK that was
perpetrated by a stranger results in an
offender hit, investigators have a good
lead as to the probable identity of the
perpetrator.
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Information about Perpetrator Identity
Forensic Index# Blood Burglary# Semen Sexual
Assault# Semen Sexual
Assault# Semen Sexual
Assault# Blood Homicide
If DNA from a SAK results in a forensic
hit, one of the case files associated with a
forensic hit may have information about
the perpetrator’s identity that could be
useful in the other case.
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Information about Perpetrator Identity
Forensic Index# Blood Burglary# Semen Sexual
Assault# Semen Sexual
Assault# Semen Sexual
Assault# Blood Homicide
Example: DNA from a SAK associated
with an acquaintance-rape could hit to an
unsolved burglary. Information from the
police report associated with the SAK
could be used to investigate the burglary.
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Step-by-Step DirectionsHow to Manage CODIS Data
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Step 1: Develop Relationship with CODIS Administrator
• What types of data can be shared?
• Can the CODIS administrator help you
interpret the data?
• How should you communicate with
them regarding problems or questions?
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Step 2: Understand the Type of Information You Need
• KIT Number (KIT ID)—the ID number assigned
to every SAK for tracking purposes
• Forensic Sample ID (ForSID)—the DNA profiles
obtained from evidence in a SAK
• Qualifying Offense Code (QOCode) and Forensic
Crime Scene Offense Type (ForClass)— the
codes representing the crime that led to a
forensic sample’s upload into CODIS
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Step 3: Identify the Kits to Include
Examples:
• All SAKs submitted 1990-2017
• All SAKs tested in the last year
• All SAKs tested with a particular set of funding
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Talk with your CODIS Administrator about :
• How is your list organized—by Kit Number or
another ID?
• How many cases should the CODIS
administrator expect to be on your list?
Step 3: Identify the Kits to Include
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Step 4: Obtain Necessary Data—Kit ID
KITNumberKIT1KIT1KIT2KIT3
The ID numbers for each kit in your list
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Step 4: Obtain Necessary Data—Kit ID
KITNumberKIT12-3456KIT12-3456KIT34-5678KIT56-7890
The real IDs may look more like this
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Step 4: Obtain Necessary Data—Forensic Sample ID
KITNumber ForSID1KIT1 KIT1-AKIT1 KIT1-BKIT2 KIT2-AKIT3 KIT3-A
The ID numbers for the forensic samples obtained from evidence in each SAK
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Step 4: Obtain Necessary Data—Forensic Sample ID
KITNumber ForSID1KIT12-3456 KIT12-3456-E01-SFKIT12-3456 KIT12-3456-E02-ERKIT34-5678 KIT34-5678-E01KIT56-7890 KIT56-7890-E01
The real forensic sample IDs may look more like this
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Step 4: Obtain Necessary Data—Forensic Sample ID
KITNumber ForSID1KIT12-3456 KIT12-3456-E01-SFKIT12-3456 KIT12-3456-E02-ERKIT34-5678 KIT34-5678-E01KIT56-7890 KIT56-7890-E01
Note: A single kit may have multiple forensic samples!
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Step 4: Obtain Necessary Data—Crime Associated with Each Forensic Sample ID
KITNumber ForSID1 ForClass1KIT1 KIT1-A 1100KIT1 KIT1-B 1100KIT2 KIT2-A 1100KIT3 KIT3-A 1100
Because all of these forensic samples are associated with a sexual assault, all will have the same ForClass1 Code
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Step 4: Obtain Necessary Data—CODIS Qualifying Offense Codes
KITNumber ForSID1 ForClass1 QOCodeKIT1 KIT1-A 1100KIT1 KIT1-B 1100KIT2 KIT2-A 1100 740.56KIT3 KIT3-A 1100
The associated Qualifying Offense code for any offender hits associated with your sample
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Step 4: Obtain Necessary Data—ID Numbers for Forensic Hits
KITNumber ForSID1 ForClass1 QOCode ForSID2KIT1 KIT1-A 1100KIT1 KIT1-B 1100 KIT4-AKIT2 KIT2-A 1100 740.56KIT3 KIT3-A 1100 KIT5-A
The ID numbers for any forensic samples that hit to SAKs (i.e., forensic hits)
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Step 4: Obtain Necessary Data—Crime Codes Associated with Forensic Hits
KITNumber ForSID1 ForClass1 QOCode ForSID2 ForClass2KIT1 KIT1-A 1100KIT1 KIT1-B 1100 KIT4-A 1100KIT2 KIT2-A 1100 740.56KIT3 KIT3-A 1100 KIT5-A 3600
The crime associated with the forensic sample associated with the forensic hit
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Step 5: Clean Your Data
KITNumber ForSID1 ForClass1 QOCode ForSID2 ForClass2KIT1 KIT1-A 1100KIT1 KIT1-B 1100 KIT4-A 1100KIT2 KIT2-A 1100 740.56KIT3 KIT3-A 1100 KIT5-A 3600
Check your dataset for data entry errors or duplicate cases!
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Step 5: Clean Your Data
Consider adding the following columns:
1. Row number
2. Crime code descriptions
3. Offender hit (yes/no) or (1/0)
4. Forensic hit (yes/no) or (1/0)
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Spreadsheet with Added Columns
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT1 KIT1-A 1100
2 KIT1 KIT1-B 1100 KIT4-A 1100 Sex. Assault
3 KIT2 KIT2-A 1100 740.56
4 KIT3 KIT3-A 1100 KIT5-A 3600 Burglary
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT1 KIT1-A 1100
2 KIT1 KIT1-B 1100 KIT4-A 1100 Sex. Assault
3 KIT2 KIT2-A 1100 740.56
4 KIT3 KIT3-A 1100 KIT5-A 3600 Burglary
Use Excel’s sort and filter features to see cases with certain types of hits only
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT1 KIT1-A 1100
2 KIT1 KIT1-B 1100 KIT4-A 1100 Sex. Assault
3 KIT2 KIT2-A 1100 740.56 1
4 KIT3 KIT3-A 1100 KIT5-A 3600 Burglary
Use Excel’s sort and filter features to see cases with certain types of hits only
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT1 KIT1-A 1100
2 KIT1 KIT1-B 1100 KIT4-A 1100 Sex. Assault 1
3 KIT2 KIT2-A 1100 740.56
4 KIT3 KIT3-A 1100 KIT5-A 3600 Burglary 1
Use Excel’s sort and filter features to see cases with certain types of hits only
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT1 KIT1-A 1100
2 KIT1 KIT1-B 1100 KIT4-A 1100 Sex. Assault 1
3 KIT2 KIT2-A 1100 740.56
4 KIT3 KIT3-A 1100 KIT5-A 3600 Burglary 1
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT1 KIT1-A 1100 0 0
2 KIT1 KIT1-B 1100 KIT4-A 1100 Sex. Assault 0 1
3 KIT2 KIT2-A 1100 740.56 1 0
4 KIT3 KIT3-A 1100 KIT5-A 3600 Burglary 0 1
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT1 KIT1-A 1100 0 0
2 KIT1 KIT1-B 1100 KIT4-A 1100 Sex. Assault 0 1
3 KIT2 KIT2-A 1100 740.56 1 0
4 KIT3 KIT3-A 1100 KIT5-A 3600 Burglary 0 1
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT1 KIT1-A 1100 0 0
2 KIT1 KIT1-B 1100 KIT4-A 1100 Sex. Assault 0 1
3 KIT2 KIT2-A 1100 740.56 1 0
4 KIT3 KIT3-A 1100 KIT5-A 3600 Burglary 0 1
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT1 KIT1-A 1100
2 KIT1 KIT1-B 1100 KIT4-A 1100 Sex. Assault
3 KIT2 KIT2-A 1100 740.56
4 KIT3 KIT3-A 1100 KIT5-A 3600 Burglary
Use these features as needed to see Kits with both offender and forensic hits or with neither
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT7 KIT7-A 1100 0 0
2 KIT7 KIT7-B 1100 KIT8-A 1100 Sex. Assault 0 1
3 KIT7 KIT7-B 1100 KIT9-B 3600 Burglary 0 1
4 KIT7 KIT7-B 1100 740.56 1 0
Use these features as needed to see Kits with both offender and forensic hits or with neither
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT7 KIT7-A 1100 0 0
2 KIT7 KIT7-B 1100 KIT8-A 1100 Sex. Assault 0 1
3 KIT7 KIT7-B 1100 KIT9-B 3600 Burglary 0 1
4 KIT7 KIT7-B 1100 740.56 1 0
Use these features as needed to see Kits with both offender and forensic hits or with neither
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Step 6: Establish Case Connectivity
Row# KIT# ForSID1 ForClass1 QOCode ForSID2 ForClass2 CrimeClass2 Off.Hit For.Hit1 KIT7 KIT7-A 1100 0 0
2 KIT7 KIT7-B 1100 KIT8-A 1100 Sex. Assault 0 1
3 KIT7 KIT7-B 1100 KIT9-B 3600 Burglary 0 1
4 KIT7 KIT7-B 1100 740.56 1 0
Use these features as needed to see Kits with both offender and forensic hits or with neither
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Consider Using Case Studies to Communicate Case Connectivity
Free tool for creating similar timelines: www.canva.com
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THANK YOU!!
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