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What is the difference between brief contact and touch DNA?

DNA analysis will not be performed on brief contact items. Brief contact items are those items considered unlikely to contain sufficient transfer of 

skin cells to the object. Examples of brief contact items would include door handles, counter tops, etc. Touch DNA analysis can be performed on 

items that would result in skin cells being left on objects due to extended contact. Examples of Touch DNA extended contact items would include 

some clothing, cigarette butts, straws, bottles, cans, etc.