The way it works is this: The criminals put a small piece of blue tape on the door (or, I suppose, the garage door) of a house – or many houses on a street. Then they come by at night to see if the tape’s been disturbed. If it isn’t removed for a number of days, they can guess that the house is unoccupied and therefore safe to break into.
Apparently, the Bernal area has had a rash of these blue-tape tags. There’s no report of subsequent break-ins, at least on the blog. But many of the neighbors there have been removing tape-tags they see.
Why does it have to be blue? I don’t know. I’d guess white masking tape would work as well.
I haven’t seen or heard of anything like this from any other source, but if you’re aware of it, let us know?