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Police Must Prove Probable Cause Before Obtaining WarrantIn order to conduct a search of a person or premises, police officers must obtain and present a valid warrant. A judge will issue a warrant based on the information presented in an affidavit from a police officer. The affidavit must show that there is probable cause to believe that criminal activity has taken place and that a search will turn up evidence of the crime. Even if a judge approves a warrant and police conduct a search, you can challenge that the warrant did not establish probable cause, which would allow you to suppress evidence from the search.

Establishing Probable Cause

A police affidavit must describe in detail what they are searching for and why they believe that a crime has been committed. For instance, a police officer can request a warrant to conduct a blood test based on evidence that they reasonably believe a driver is under the influence of alcohol. When requesting to search a private residence, the affidavit must show probable cause by:

  • Presenting objective evidence of criminal activity at the residence and involving the accused parties; and
  • Establishing the credibility of the source of that information.

A police officer who claims to have witnessed the alleged criminal activity is generally considered a reliable source, based on their experience in such cases. Other sources are less reliable, particularly when they are police informants who may be providing information in exchange for leniency on their own criminal charges.

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