A portable monitoring apparatus includes a bracelet having a housing and a strap for connecting the bracelet with a body part of a person being monitored, and an electronic monitoring circuit disposed in the housing. The electronic monitoring circuit executes an executable program for controlling the monitoring circuit according to a control algorithm. The executable program is modifiable by over the air programming from a monitoring network having transmitting and receiving circuits in operative communication with the electronic monitoring circuit. The housing of the bracelet includes a contract portion configured to engage the skin of the person being monitored and a cavity portion having an opening defining a closed sampling volume when the base is in contact with the person. An alcohol sensor is disposed at the sampling volume for detecting a physiological condition of the human and generating a signal thereof.