2009 in Australia saw almost 8.2 million reports of illegal break-ins and burglaries, mostly in the northern and western regions of the continent. And of all the reported incidents, 20% of them were of repeat occurrences, where the house has been robbed more than once.
Mostly, this happens when the burglar is so familiar with the house that he knows how and when to get into the house without being caught. In all these incidents, the one mistake that has been found to be common is that the owners do not bother to update their security systems of even their locks thinking that the burglar might not return after the first break-in.
Which is why, it is important to ensure that every time one leaves their home, the double check onto the security measures as well as the locks.