Medical and Legal Investigations of Death Discussion Board

Please explain Locard's Exchange Principle and its relevance to the collection of evidence pertaining to a suspicious death.  With consideration to Locard's principle, what precautions must the death investigator take when working a death scene? What is the purpose of bagging hands and/or feet? In what type of cases should the hands and/or feet be bagged? Please explain or justify your choices.  Be sure to support your opinions with credible research and to cite and reference your sources in APA style. Remember, writing mechanics count in every post you make.