In describing the various contexts in which EM is used in Los Angeles County, the authors focus on intensive probation supervision; the Supervised Release Program, which releases felons from jail to EM supervision; the work furlough EM home detention program; the Community Detention Program, which targets the juvenile probation population; the use of EM with gang members involved in drug-related violence; EM for drug offenders with an order for narcotic testing as a condition of probation; and the EM/Home Detention Program. Other topics discussed are EM equipment selection and criteria establishment, addressing bureaucratic barriers in the implementation of EM programs, and EM costs. The paper concludes with a listing of key aspects of a successful EM program. They are the inclusion of all affected personnel and agencies in prior planning; specific and attainable goals with quantifiable measurement that allows evaluation; the definition and study of affected offender populations; and direct contact between the monitoring staff and the supervising deputy officers when monitoring is done by private vendors.