evidence packaging: a how-to guide - home | state of california
TRANSCRIPT
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Evidence Packaging: A How-To Guide
Terry Spear, John Rush, Jerry Massetti, Jim Weigand and Mark Traughber
California Department of Justice
Bureau of Forensic Services
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Goals of Evidence Packaging
Protects personnel from possible hazards associated with evidence:
Accidental firearm discharge
Biohazards
Sharp objects
Health hazards associated with exposure to mold • Wet plant material
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•
•
Scene to scene
Item to item
Deterioration
Goals of Evidence Packaging
Protects evidence against: Loss
Contamination
Cross-transfer •
•
Suspect to victim
Victim to suspect
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Evidence source Origin – where was evidence when it was collected
Custodial Agency
Chain of custody
Provides a unique identifier so it cannot be confused with any other evidence item
Laboratory case and item number
• •
•
Goals of Evidence Packaging
Correctly identifies evidence with respect to:
Evidence description: What is it?
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Packaging
Can indicate
What processing is needed • For example: “Fingerprint processing required”
Health hazards (e.g. sharp knife)
Required or preferred storage conditions • • “Store at room temperature”
“Store frozen”
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Elements of packaging evidence
Does evidence need to be prepared for packaging?
Certain types of evidence may need to be dried before it can be packaged:
•
•
Wet biological samples
Fresh plant material
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What Can Happen When Biological Evidence is Packaged Wet?
Evidence “leaks” through to the exterior of the container
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Elements of packaging evidence
What type of packaging is optimal? Plastic: What type of plastic? • •
Envelope
Bag
Paper • • •
Envelopes
Bag
Boxes
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Sometimes Plastic Containers areOptimal: Controlled Substances
Kapak packaging can prevent exposure to potent drugs
LSD on blotter paper
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Sometimes Paper Containers are Optimal: Biological Samples
Allows a sample that is not completely dry to finish drying and May prevent the deterioration of a biological sample if it is not completely dry when packaged
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What Happens When Biological Evidence is Wet?
Evidence “leaks” through to the exterior of the container, resulting in:
Sample deterioration
Sample loss
Contamination issues
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Elements of Packaging Evidence
What type of packaging is optimal?
Size of container is important • Too small and the packaging is likely to fail
over time
• Too big and evidence can be dispersed throughout container and difficult to recover (e.g. powder, trace evidence)
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Elements of Packaging Evidence
This envelope is too small for the evidence it is holding
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Elements of Packaging Evidence
Does evidence require internal packaging?
Bindle
Box
Coin envelope
Hold down device
Syringe tube/”sharps” container
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Glass Fragments Deposited into Large Envelope
Small glass fragments can be lost from poorly sealed envelopes Ideally, these fragments would be packaged into a bindle first
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Type of seal
Need for identifying mark
Where seal(s) is to be placed
Sealing Evidence
Sealing evidence properly is a requirement of most crime labs
Issues:
•
•
•
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Ways evidence can be sealed Heat seal
Tape seal
Lock seal
All seals must be initialed to document the person sealing the evidence and dated to indicate when the evidence was sealed
Sealing Evidence
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How Not to Seal Evidence
Seal should completely sealenvelope flap
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How Not to Seal Evidence
Seal should completely seal bag flap
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How Not to Seal Evidence
Staples are not an appropriate evidence “seal”
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How to Correctly Seal Evidence
Tape seal across entire flap of envelope Seal is initialed and dated
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How to Correctly Seal Evidence
Tape seal across entire “flap” of bag Seal is initialed and dated
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Biological Evidence
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Packaging Biological Evidence
Insure the sample is dry
Do not dry in a heated air stream
Use paper containers
Immobilize evidence when necessary
“sharps”: knifes, broken glass
when stain could be dislodged
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Recommendations for Collection of Biological Evidence
Collect and package stains separately--do not allow separate stains to come into contact with one another Sheets of paper can be used to minimize
contact of stains on a bloodstained garment
Consider packaging all biological samples separately • A bloodstain swab and its control can be separately
packed into two coin envelopes and then both envelopes can be placed into the same larger envelope
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Recommendations for Collectionof Biological Evidence
To minimize the chanceof cross transfer of adhering evidence; different clothing items should NOT be packaged in the same container
No!
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Recommendations for Handling Biological Evidence
Attempt to insure that anything that contacts biological samples during collection is free of anything that might contain human DNA
Work on clean surfaces
Wear cloves and change when necessary
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Packaging a Wet Bloodstain on a Swab
After samples are dried, package the bloodstain sample and the control into separate coin envelopes
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How NOT to Package a WetBloodstain
Do not use any packaging device that limits air exchange
Biological samples will deteriorate if it takes too long for them to dry
No!
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Packaging a Dry Bloodstain
Once the sample is dried it can be safely placed into a paper envelope and sealed
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Packaging Bloody Clothing
Attempt to allow bloodstains to dry as much as possible Place clothing onto a piece of clean paper
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Packaging Bloody Clothing
Place paper between stained areas so as to prevent stain transfer
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Packaging Bloody Clothing
Place paper between stained areas so as to prevent stain transfer
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Packaging Bloody Clothing
Seal and date paper package with bloody shirt Insert paper package into larger paper bag
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This is NOT the proper way to package a bloody knife
Although paper is good packaging for bloodstained evidence
This knife needs to be immobilized because…
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This is NOT the proper way to package a bloody knife
It can easily pierce the paper envelope and endanger any-one who handles this evidence
In addition, blood from the blade can be easily lost
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How to Properly Package a Bloody Knife
Use a cardboard box (not airtight) Immobilize knife to protect both personnel & the blood sample on blade
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Packaging Trace Evidence
Trace evidence is small evidence and can be easily lost
Examples of trace evidence:
Hairs
Glass fragments
Paint flakes
Fibers
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Packaging Trace Evidence
If it is necessary to remove and package trace evidence, its nature and location must be documented before the evidence is altered
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Items must be visually examined and trace evidence identified
Trace evidence can be removed with tweezers and placed into appropriate packaging
Trace evidence can also be removed with tape lifts
Packaging must be appropriately sized & designed so that this small evidence cannot fall out of the container
Packaging Trace Evidence
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Glass Fragments
Glass fragments are small and can be lost from poorly sealed envelopes
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Glass Fragments Deposited into Large Envelope
Small glass fragments can be lost from poorly sealed envelopes These fragments need to be packaged into a bindle before being placed into envelope
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First Step: Placing Glass Evidence into a Bindle
The glass is collected and placed into a paper bindle The bindle is then sealed before it is inserted into an envelope
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Packaging Paint Fragments
Bindles can also be used to package paint fragments
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Packaging Paint Fragments
Rigid boxes can then be used to hold paper bindle with fragile paint fragments Box is then placed into paper evidence envelope
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Firearms Evidence
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Packaging Firearms Evidence
Record all necessary information about condition of firearm:
Position of hammer, safety, & other controls
Number and location of fired and unfired cartridges
Presence of powder residue “halos” on revolver cylinder face
Blood or trace evidence visible on gun exterior
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Handling Firearms Evidence
This weapon is loaded and ready to fire
NEVER PACKAGE A LOADED WEAPON
Remove the magazine & make sure chamber is empty
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Firearms can be handled by any surface which does not take fingerprints
Serrations on slide
Checkered stocks
Handling Firearms Evidence
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How NOT to Handle Firearms Evidence
Do NOT insert anything into the barrel
EXTREMELY UNSAFE!
Could alter the firearm
Could remove blood or trace evidence
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Handling Firearms Evidence
Once the firearm has been rendered safe, it can be placed into a cardboard box and
Immobilized with a plastic tie
Make sure the tie goes BEHIND the trigger
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Handling Firearms Evidence
This packaging will permit fingerprint, blood and trace evidence to be recovered
The evidence now needs to be appropriately labeled and sealed
Write “Unloaded” notification on outside of container
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Handling Firearms Evidence
Fired bullets need to be carefully handled to protect critical markings on the bullet surface and any adhering trace evidence
Do NOT mark bullet
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Handling Firearms Evidence
This type of evidence requires some internal packaging
Paper bindles or soft tissue can be used
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Handling Firearms Evidence
The wrapped bullet can now be placed into an appropriate size container
This container must be labeled and then • Placed into a large
evidence container
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Handling Firearms Evidence
No need to remove cartridges from the magazine at scene
The magazine with cartridges can be placed into an appropriate sized paper envelope
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Handling Firearms Evidence
Package loose cartridges in paper envelopes
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Drug Evidence
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Packaging Drug Evidence
Drug Evidence Packaging needs to accommodate:
Health hazards associated with certain drug items
•
•
Syringes
Evidence carried in body cavities
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Packaging Drug Evidence
•
•
•
Drug Evidence Packaging needs to accommodate:
Variable characteristics of drug evidence:
• Different drugs have different possible health hazards to personnel handling exhibits
Some drugs are very potent in small amounts
Liquid samples
Sharps
Multiple forms •
•
Powders, sticky tar, residues, plant material
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Kapak pouches Safely contain most drug evidence & protect personnel against unnecessary exposure
Need to be heat sealed
Airtight Not good for fresh plant material
Appropriate Packaging Materials for Some Drug Evidence
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Appropriate Packaging Materials for Some Drug Evidence
Sealed Kapak pouches can safely contain potent drug evidence & protect personnel against unnecessary exposure
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Sealing Kapak pouches
Heat sealers
Obtain one large enough to accommodate opening of Kapak pouches being used
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Poorly Sealed Drug Evidence
Seals placed too close to evidence make it difficult for the analyst to re-seal evidence after analysis
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Properly Sealed Drug Evidence
Seals are placed far enough away from evidence to allow re-sealing this item after analysis
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Appropriate Packaging Materials
Suitable plastic bag purchased with label and seal Plastic containers should be impervious to chemical solvents (e.g. Kapak pouches)
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Choose an Appropriate Sized Container
Do not place a small amount of powder in container that is too big
Powder is difficult to recover because electrostatic charge causes it to disperse and cling to plastic surfaces
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Inappropriate Packaging for Drug Evidence
A paper envelope & paper bindles are not by themselves sufficient packaging for bindles containing drug evidence
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Inappropriate Packaging Materials
Do not use sealed plastic containers to package fresh or wet plant material -Evidence can get moldy Use paper envelopes or bags– They allow fresh plant material to dry
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Appropriate Packaging Materials
Plastic containers can be used if plant material is completely dry
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Minimize Items Submitted
Package the pink bindle and wooden box separately Submit only the bindle to the laboratory for drug analysis Avoid submitting paraphernalia
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Packaging Drug Evidence
The bindle can be sealed in a Kapak pouch and then placed into large paper envelope
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Syringes May Not Always be Accepted into Crime Labs
Consult your laboratory as to their acceptance criteria and specific packaging requirements
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Syringes
Syringes can be a significant biohazard and need to be handled and packaged very carefully Use a “one handed”
technique when handling syringes
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Instead of Submitting Syringe:
When possible, transfer liquid contents of syringe to a suitable container and submit this container only
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Packaging Syringes
If it is necessary to submit a syringe, package it in a puncture-proof container designed for packing syringes