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• GARCIA, 2004


  The purpose of this rule is to avoid the mutilation, alteration, and contamination (MAC) of

  the pieces of physical evidence found at the crime scene.
• CRIMINAL INVES 


  Discussed in the preceding section. It is a process that involves several steps.
• COLLECTION


  This element refers to the gathering this identify data or facts, or physical things that are

  significant to the case under investigation.
• PRESERVATION


  This element refers to the process of determining the probative value of the evidence.
• PATTERNS


  are serious of similarities that may link particular cases or indicate that the same

  person is committing a series of crimes
• RECOGNITION


  This element involves the efforts of identifying data, including physical things that may

  provide relevant information regarding the criminal case being investigated.
• CULTIVATED


  Information are furnished by informants or informers.
• GRAPEVINE SOURCES


  When the information is disclosed by the underworld characters such as prisoners or ex-

  convicts.
• INFORMATION


  These are the knowledge or facts which the investigator had gathered or acquired from persons or

  documents, which are pertinent or relevant concerning the commission of the crime or criminal activities
• FRIENDLINESS


  A friendly approach coupled with a posture of sincerity may induce the suspect to confess.