They are often asked to help with appeals for missing dogs and cats.
Now, East Lindsey District Council is investigating the disappearance of something slightly more unusual in Horncastle... a blue plaque.
The plaques are often displayed on walls of buildings, highlighting any historical significance in a particular location.
However, a plaque outside the recently opened Costa Coffee outlet in the Market Place has disappeared.
In a tweet, Horncastle History and Heritage Society has asked what has happened to the plaque.
They say it was put up by the Society and was part of a town trail around a conservation area.
They add the plaque was included in planning documents relating to the conversion of the building from a hardware store to a Costa outlet.
The matter was discussed by members of the Horncastle Together group who reported it to ELDC.
In a tweet, ELDC say they have handed the disappearance on to their planning enforcement department.