The police are typically asked to get involved with a wide variety of tasks other than their main job of stopping crime and dealing with criminals. They are asked to be involved in family disputes, in civil disputes that can suddenly turn nasty, and other similar issues. For example, in the US, the 911 dispatchers have been asked to help when people are not getting served in restaurants, when pets climb trees and need to be coaxed out, and so on. But getting involved with the supernatural ? A lot of police forces do not acknowledge the presence of the supernatural, and will not get involves, as happened in the current case (link to article):
A woman has sought the help of police to detain the "spirit" of her dead brother, which she claimed has been disturbing her. Local media reports said the woman's brother had died years ago.
The woman only left the police station after the authorities explained to her that they could not detain a "spirit" and asked her to seek help from religious bodies.