Implantable device for locating drug users

A method of determining a location of a patient that consumes a drug comprising the steps of:

• providing a medical device comprising a drug sensor and a global positioning system module connected to a wireless network;
• implanting the medical device into the patient so that the drug sensor is disposed within a blood layer of the patient;
• detecting a consumption of a drug by the patient via the drug sensor;
• and
• sending a location message comprising a location of the medical device over the wireless network to a remote computer.

A system of determining a location of a patient that consumes a drug comprising:

• a medical device implanted in a patient's body, wherein the medical device comprises a global positioning system module connected to a wireless network and a sensor operable to sense change in an animal's blood composition when the animal consumes a drug;
• and
• a remote computer connected to the wireless network, wherein the remote computer comprises a processor and a memory, wherein
• when the sensor senses the change in the animal's blood composition, a location message comprising a location of the medical device is sent over the wireless network to the remote computer.