When Dr. Lillehei was putting these patches in the children to close the ventricaluar septal defect, there's a critical nerve that runs right along that hole, and it's invisible.

CNN: Pacemaker pioneer now lives with device

Investigators are constantly being called in to sniff out traitors selling critical business information to the competition, or plotting to defect with the crown jewels - such as the client list, or details of products in development.

BBC: I spy with my private eye.....