Transfer and Persistence
When people or things come in contact with each other, small amounts of material can be transferred. This could be for example, DNA or fibres from clothes, or soil from shoes. Transferred materials may stay (or persist) on the surface they have moved onto (such as a jumper or a chair). When forensic scientists examine pieces of clothing or shoes or other objects they will collect these transferred materials and examine them to try and work out what they are and where they may have come from.
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