At the scene of a homicide, you need to collect stains from the following items. Document the method of collection and t

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At the scene of a homicide, you need to collect stains from the following items. Document the method of collection and the packaging used for the item. Please provide an answer for each article rather than just one of them. thanks!
A. A bloody knifeB. A wet pool of blood in a sinkC. A shirt containing possible bloodstains (still wet)D. A bloodstained rugE. A bloody shoeprint