#29. The Burglary Mystery

#29. The Burglary Mystery:

A couple reported a robbery. The husband told the policeman, that he thinks that the burglar presumably entered the house by breaking through the window, pointing to the broken window glasses on the outside of the house.
The policeman noticed that inside the house only a few tiny pieces of window glass particles were scattered around near the broken window area and told him that it was not a burglary and no outsider has entered his house through that window. What made the policeman so sure?

Did you solve the riddle?!