Someone Planning Burglaries 14/12/2012
Someone is trying to identify unoccupied properties, doubtless with a view to breaking in while the occupants are away on holiday.
The MO is to put a piece of chewing gum on the front door, wedge a bit of bread in the door, or place some kind of object in an obvious position and which would normally be cleared away. The burglar then returns to see if the object has been removed and if not, they have carte blanche to break in with a much reduced chance of being caught.
Please keep an eye on neighbour's houses or, if you are going away, ask a neighbour to keep an eye on yours.