If your property is a participant in a Crime Free Multihousing Program or have begun a Neighborhood Watch Program, then you will be working with local police agencies and there will be a casual exchange of information on a regular basis. When I worked a project based Section 8 property, the first night I worked late (it was 11:00 PM and I was running vouchers for 11 properties) I received a phone call. It was from the police officer who usually patroled in the area. I was completely new to that job, the neighborhood and the property. He told me to call him when I was ready to leave, so I did. He came to the door and walked me to my car. I noticed that there were patrol cars blocking the entrances and exits to my property - and it shocked me. The officer told me to NEVER be there at that hour alone again and if I found myself there alone to call and ask for an escort. That was the start of a beautiful relationship with the entire police department. However, when it comes to providing private information about a Resident, just to play Devil's Advocate, there is a line. How far do you go? Don't all residents have a right to some privacy?
I think one should really check your Company's policy on this topic, especially if you don't have a Crime Free program or Neighborhood Watch affiliation. You do not want to be held liable or your Owner/Management Company held liable for giving out information. I see no one has even said this, but I would not just give out information without at least checking your company's parameters.
You absolutely should check an Officer's credentials. This includes those who claim to be IRS agents, etc.