Would you suggest testing an item of clothing for touch DNA that has been laundered? It is highly unlikely that the shed skin cells will remain on an item of clothing that has been laundered.
• How does touch DNA processing differ from low copy number (LCN)? LCN is used on items where only minimal contact has occurred or there are only small quantities of cells/DNA present. Differently from touch DNA processing these samples go through a higher number of PCR cycles which can obtain a DNA profile where conventional PCR would not. LCN work has to be done in special hoods and there is a higher chance of getting mixed profiles. LCN is usually only used on a sample that has already been processed, has an indication of DNA present, but cannot be re-worked any further using standard DNA methods. • Case Scenario: The suspect grabbed onto a sweatshirt that the victim was wearing and the victim was able to wiggle out and get away. The sweatshirt was left behind. Could this be tested for touch DNA? Yes, it is best to send the entire sweatshirt and either provide a detailed description of where the attacker grabbed it, or mark the area on the clothing.
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- Would you suggest testing an item of clothing for touch DNA that has been laundered? It is highly unlikely that the shed skin cells will remain on an item of clothing that has been laundered.
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