sfgate.com writes:

Washington -- A microchip that can be implanted under the skin to give doctors instant access to a patient's records was approved by the government Wednesday...

The tiny electronic capsule... transmits a unique code to a special scanner that allows doctors to confirm a patient's identity and obtain detailed medical information from an accompanying database.

...a way to improve care and avoid errors by ensuring that doctors know whom they are treating and their personal health details.

While this opens up a big can of worms with respect to privacy, it also opens up for (scary) applications of situational software.