(Springfield, IL) -- Can police officers sift through a person's cell phone if they don't have a search warrant? That's the question that the US Supreme Court is set to make a decision on sometime this month, but some Illinois police departments say they're already taking that step. Sergeant Mark Folkenroth with the Quincy Police Department says getting a warrant ensures that the evidence collection process is legitimate. Some privacy advocates believe that searching through cell phones without a warrant is an invasion of privacy. That's because it contains so much vital information like banking records, emails, videos, and pictures. The justices are expected to decide if that's the case, sometime by the end of this month.