Olemiss - the technology to turn any electronic device on or off was developed a few decades ago. The technology is called X10. It has fallen into a kind of dormancy in recent years. Radio Shack is the world's largest retailer of this technology, though if you go into a Shack and ask the clerks about it, most won't have any idea about what you are talking about.
There's tons of X10 info and products on the Internet.
IMO, a biometric front end on this is completely unnecessary as a simple code will do. Why you would need security on an appliance activation/deactivation device is beyond me. Neither my toaster, my TV, nor my hot water heater require security now. Why they would 6 months from now escapes me.