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carried out by a single person involves the searcher walking in a circular fashion from the outer point of the crime scene towards the central point DO NOT START IN CENTRE AS EVIDENCE MAY BE DESTROYED
entire scene is divided into zones that are searched individually best for searching for a small object
area is divided into strips about 1 metre wide. the searcher examines each strip separately. best for outdoor area
advance on the strip method searchers complete the strip method and double back across the area being searched
walls and ceilings should be examined beat to work from top downwards critical evidence may be found in the least obvious places
similar to indoors, fingerprints found less frequently, almost all evidence will be on the ground.pay attention to fragile evidence as it may be destroyed. protect 2D or 3D impressions footprints. note any odours.
packaging must be new, before taking any item make a note of its position and appearance, each item should be properly packed and labelled
sources of contamination
contamination occurs when trace evidence transfers to or from the scene after crime and before forensic analysis
direct contact between items from different aspects of the case or between victim and suspect after incident
wear clean disposable over garments, gloves and masks, never talk over evidence, clean all examination surfaces, items packed sealed and labelled before removal from the crime scene and not reopened before examination different police should deal with different sides of the case, victims and suspects not be transported in the same car.
each item should have a clear lable with this information police district concerned, nature of occurrence or crime, name of injured party, name of accused suspect, where and when item was found, identifying number, name of person who found the item, date
envelopes, screw cap glass vials, saleable plastic bags, air tight containers should not be used for bloodstained items as mould may grow paper bag is used instead, charred items of fire should be sealed in air tight containers to stop evaporation of petroleum residues
glassine evidence envelops
used for collecting hairs, fibres, glass, paint eliminates static electricity
comparison of evidence to known standard
removal of pint from suspects vehicle to compare with paint on body of hit and run victim
unstained areas of clothing compared at the same time as blood stained to check material is not affecting lab results
submission of evidence to laboratory
evidence submitted together with a form derailing case history, all items are listed and numbered, specifies tests to be carried out
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