My current project is an urban fantasy/mystery, starring a PI who is part supernatural hound. One of his talents is an enhanced sense of smell which allows him to sniff out magic. Without going into the whole thing, I've come to a point where my PI is about to interview a potential witness for his case (whose actual name and address he doesn't actually know; he's inferring from things someone else said), and he discovers that the witness might have been murdered. Her house is all cordoned off, and the police are doing their thing when he arrives. I guess this is my question (keeping in mind that the investigating officer is a contact of his who is aware of the supernatural and the PI's inhuman nature): Is it possible (or, an acceptable level of artistic license) that the police detective would allow my PI access to the crime scene for the purpose of identifying the victim as a magical being? OR Would my PI be denied access to the crime scene, but brought something of the victim's to smell?