It's usually a goodidea to have the securityofimportantbiometricinputdevicessupplementedbyhaving in-the-flesh guards, thus greatlyreducing the riskof physical tampering.
One team has developed biometric heartbeat sensors to allow devices within a body to communicate with each other, keeping out intruding devices and signals.
In fact, all of the devices in Darby's home -- from the biometric mouse that has his computer reading fingerprints instead of asking for passwords to the media center in his lounge -- are available for ordinary consumers to buy in shops.
Its members obsessively track biometric, behavioral and environmental information with smartphone apps and body-monitoring devices, and perform experiments on themselves to try to improve their lives.