| Term The case of Frye v. United States deals with the legal issue of: Definition General acceptance of scientific principles | Term A victim’s fingernail scrapings would be correctly packaged in: Definition A druggist’s fold | Term Name at least two forensic databases: Definition IAFIS and CODIS |
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How are fingernail scrapings packaged?
This is suspected of having been used in the crime, or of having been at the crime scene, should be
individually wrapped
. Each should be placed in a wooden or heavy cardboard carton.
How do you package charred debris?
Charred debris recovered from the scene of a suspicious fir must be
sealed in an airtight container
to prevent the evaporation of volatile petroleum residues. Airtight containers can cause condensation of moisture within the container and result in bacteria that can destroy, alter or contaminate the blood.
What should the investigator who packaged the evidence write on the evidence tape seal?
T/F: The investigator who packaged the evidence must write
his or her initials and the date on the evidence tape seal
, and the evidence should be opened at a different location on the packaging for further testing.
What type of evidence must be packaged separately from other evidence?
Always
package tubes of blood
separately from any other evidence items in a crushproof container. Evidence that is wet or that may contain body fluids (blood, semen, etc.) must be air-dried completely. Such items should be packaged in paper bags/boxes.
Can u find DNA in nails?
Please understand that fingernails and toenails are made of keratin (like hair), not cells with a
nucleus containing DNA
, so it’s not easy, but they are produced from cells and some cells are embedded or attached. … Fingernails stored at room temperature for 10 years and longer have yielded enough DNA.
Does a finger nail have DNA?
Nails contain genomic DNA
that can be used for genetic analyses, which is important for large epidemiologic studies that have collected nail clippings at baseline and for future epidemiologic studies that consider collecting nails as a DNA source for genetic analyses.
Which type of evidence should never be packaged in plastic containers?
There’s a simple rule of thumb for deciding which type of evidence packaging—wet evidence goes in paper containers (wet evidence can degrade if placed inside plastic containers) and
dry evidence
goes in plastic. Items that could be cross-contaminated must be packaged separately.
Which type of evidence should be collected first?
In order of collection,
the most fragile evidence must be collected first
. A crime scene investigator may start with hairs and fibers and fingerprints and then work his or her way through the evidence, peeling back one layer at a time.
How do you get fire debris evidence?
Porous plastic,
synthetic fibers, cloth, paper, or cardboard
in direct contact within the pattern will absorb any possible liquid which might have been used to expedite the fire. Inside cracks, tears, seams, or deck drains are other good collection areas for residue, since liquids will collect or pool in these areas.
What can degrade a biological sample collected as evidence?
Improperly used,
bleach
could destroy biological evidence. There will be occasions when it is not possible to collect a stain by cutting it from an object (e.g. stain is on a concrete floor). … It may be useful to test the “unstained” area with an appropriate presumptive test to see if it contains a biological sample.
What types of evidence requires a standard reference sample?
A standard/reference sample is material of
a verifiable/documented source
which, when compared with evidence of an unknown source, shows an association or linkage between an offender, crime scene, and/or victim (e.g., a carpet cutting taken from a location suspected as the point of transfer for comparison with the …
How must an evidence collector take care?
The evidence collector must take extraordinary care to avoid potential contamination by transferring DNA onto objects of evidential value by:
Wearing a face mask
. When biological samples of unknown origin are discovered at a crime scene, investigators: Should assume pathogens are present and treat the sample as such.
Who is responsible for the custody of the collected pieces of evidence after its collection?
An identifiable person must always have the physical custody of a piece of evidence. In practice, this means that
a police officer or detective
will take charge of a piece of evidence, document its collection, and hand it over to an evidence clerk for storage in a secure place.
What evidence can be collected from a bullet and a cartridge?
This evidence includes
fingerprints, blood, hair or fibers, cylinder “halos”, and debris in the barrel and/or cylinder
. The weapon should be handled on those areas least likely to retain latent fingerprints such as knurled or checkered areas.
How do you transport evidence?
Use plastic bags
for the transportation of biological evidence only when there are excessive body fluids and possible contamination of people and other evidence items. Use paper packaging if saturation is not a possibility. Never package wet or moist body fluids in plastic bags for long periods of time.
