Body fluids at a crime scene

How are body fluids identified at a crime scene? Are there any considerations that need to be taken regarding how body fluids are identified, Why? Which of these fluids is easily located by Alternative Light Source? Blood, Semen, Soap What is the best method for collecting wet blood at a scene and what is a good method for collecting dried blood at a scene? Read the following article on the European serial killer, the Phantom of Heilbronn http://altereddimensions.net/2014/phantom-of-heilbronn-german-dna-blunder-contaminated-evidence-police-manhunt What do you think about the cases? How likely is it that we have evidence similar to this sitting in storage lockers across the U.S.? Are there any special considerations that need to be taken when collecting evidence and reference samples from a suspect in a sexual assault case? What types of evidence might we expect to find on this type of suspect? In your own define words drug chemistry and forensic toxicology, then decribe the diffreneces and similarities between the two.      

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