The system 23, wherein {TAIL ~ the user} monitor module comprises a radio frequency identification device, wherein the radio frequency identification device is capable of drawing {HEAD ~ power} from the radio frequency waves to transmit a signal carrying an identification of the radio frequency identification device 
The system 23 , wherein { TAIL ~ the user } monitor module comprises a radio frequency identification device , wherein the radio frequency identification device is capable of drawing { HEAD ~ power } from the radio frequency waves to transmit a signal carrying an identification of the radio frequency identification device
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH