FSC239Y5 Lecture : FSC239 Feb 10 2011

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The microscopic debris that covers our bodies are the mute witnesses sure and faithful, of all the our movements and all our encounters. Fibres and hairs can be transferred between individuals, between individuals and objects or between objects. 2 purposes: investigative or associate: collection of trace evidence, hair identification. Transfer and persistence: app 80% of hairs/fibres is lost in the first 4 hours from contact/transfer. Efficient collection of evidential extraneous hair and fibres. Proper handling of evidence: case item are segregated into groups which originate from a common source, a sequence is chosen for taping items from different sources so that potential contamination is minimized. Items from different sources are taped in different h&f taping rooms by qualified h&f personnel: a different lab coat is worn for taping items from different sources, work area is cleaning before and after taping and mounting. Stereomicroscopy: comparison bright field and fluorescence microscopy.

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