By giving that power to police officers, don't you think they'll freely use all the information they can obtain? Any police officer could then request personal information from anyone on this or that person, and they'd be required to give it to them. When they request information, do your police officers talk to the person about the crime that another person might have committed?
A police officer can't communicate information on the investigation he is conducting to the person from whom he requests information. Is that correct? If you don't talk about the investigation, do you simply tell the person that you're requesting information because a crime has been committed or something else? You tell that person that you're a police officer and you ask him to provide you with information on another person. Is that your way of proceeding? Do you provide any details on the investigation, or do you limit yourself to the specific information you want to obtain?