List at least three advantages of having an evidence-collection unit process a crime scene instead of a patrol officer or detective.

Advantages of having an evidence-collection unit process a crime scene include:
 They have specialized training and procedures that ensure preservation of evidence.
  They provide an objective approach to evidence collection that removes emotional elements that may be a factor for those with more familiarity of the situation.
 They ensure that no party is able to add or remove relevant evidence to or from the crime scene.

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