The evidences could be
Testimonial , evidence includes oral or written statements given to police as
well as court testimony by people who witnessed an event, or could be Physical
evidence refers to any material items that would be present at the crime scene,
on the victims, or found in a suspect’s possession. Also could be Trace evidence refers to physical evidence
that is found in small but measurable amounts, such as strands of hair, fibers,
or skin cells. .
Collecting evidences is
very important step in the investigation to find a key element of a crime that
confirm the future of suspected person .
1.1.1. Packaging Evidence
Each different item or
similar items collected at different locations must be placed in separate
containers that Prevents damage through contact and prevents cross-
contamination . Forceps and other similar tools may have to be used to pick up
small items . Any evidence that is wet must be air dried before being placed in
a container , and Bloodstained evidence should never be stored in an air-tight
container , could cause mold growth which damages the evidence . and must be
packaged in paper envelope or paper bags after drying . Plastic bags should be
avoided because water condenses them , especially I areas of high humidity and
water can speed the degradation of DNA molecules . Packages should be clearly
markes with case number , item number and collection date
Stains on unmovable
surfaces may be transferred with sterile cotton swabs and distilled water , Rub
the stained area with the moist swab until the stain is transferred to the swab
. Allow the swab to air dry without touching any others . Store each swab in a
separate paper envelope . Collected,
cataloged and sent to forensic lab
Victim’s clothing ,
Fingernail scrapings , Head and pubic hairs , Blood (for DNA typing) , Vaginal,
anal, and oral swabs (in sex related cases) ,Recovered bullets from the body
and Hand swabs from shooting victims .
1.1.2. Standard Reference Samples
Collection must include
not only evidence, but standards for comparison. You must know what you are trying to match or
eliminate from the crime scene for use in the laboratory , e.g hairs, blood, fibers, or soil samples.
1.1.3. Processing Evidence
Physical evidence must
be handled in a way that prevents any change from taking place between the time
it is removed from the crime scene and received by the laboratory. Changes can
arise through contamination, breakage, evaporation, accidental scratching,
bending, or loss, due to improper or careless packaging.
1.1.4. Protect the Evidence
Preserve evidence with
proper packaging Proper storage , Use appropriate labels e.g biohazards
labels ,( Case#, Initials, Descriptive
label, date packaged) and a sign across
your seal .