Reverse ATM PIN?

The recent tragedy of a young woman being kidnapped and eventually killed, after she had repeatedly given the kidnapper a wrong pin to her ATM card.
If she knew the method below, she could have been saved. So I think it is important that you should remember this working method.
If you should ever be forced by a robber to withdraw money from an ATM machine, you can notify the police by entering your PIN # in reverse. For example, if your PIN number is (1234) then you would put in (4321).
The ATM recognizes that your pin number is backwards from the ATM Card you placed in the machine. The machine will still give you the money you requested, but unknown to  the robber, the police will be immediately dispatched to help you.
This information was recently broadcasted on FOX TV and it states that it is seldom used because people do not know it exists.
PLEASE PASS THIS ALONG.