The technician plugged the board into a data logger and attached two more wires to each of the belts.
The Letter Logger was developed by TrackingTheWorld, a company based in Burlingame, California.
The Star Wars: The Old Republic Combat Logger, for instance, keeps track of in-game damage, threats and healing data on-screen.
Mr Scarfo's lawyers say the FBI infringed their client's constitutional rights, but the Bureau argues the key logger does not fall under the terms of current legislation on bugging.
The Letter Logger can be programmed to check its position every few minutes, over longer intervals, or only when a built-in motion detector senses movement, says Jude Daggett, of TrackingTheWorld.
The sensors embedded in the fabric measure the user's breathing, and a small data logger with a USB port which must be attached to the shirt because it's not waterproof records the output from the sensors.
The United States Post Office did not require the Letter Logger to do this, however, in part because mail often travels in aircraft, and transmitting devices must be switched off during take-off and landing.
The move follows the creation of a spoof e-mail address for Mr Blair which was set up by a web-logger who then began forwarding the hundreds of emails he received for the Prime Minister to Downing Street.
When users later visited one of a hundred major banking sites the software was designed to target, the program would spy on them using a "post-logger, " a program that inserts fake entry fields into Web sites and records passwords.
Without being prescriptive it is expected that a typical station configuration will consist of a primary tide gauge, two under water pressure sensor (secondary tide gauge), data logger, DCP geostationary satellite transmitter, modem, battery backup, solar panel, cables, mountings.
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