Anyone engaged in espionage in Israel would be well advised not to swallow any incriminating evidence. The ministry of defence in Haifais in the process of patenting a video camera for use inside the body. (New Scientist, Voll47, No 1997)

Suspects are to be asked to swallow a capsule containing a complete video camera, lamp and low-power transmitter. The camera captures images of the gut. It is connected to a radio frequency amplifier which transmits the video signal at a frequency of around one gigahertz.