Some time ago I offered some thoughts in this space about how to take the bottle away from dangerous drunks: from people who, under the influence, drive or commit assaults.
Jim Leitzel at Vice Squad reports on an alternative approach: an ankle bracelet that allows continuous remote monitoring of alcohol consumption by measuring the alcohol that transpires through the pores. Expensive ($12/day) but worth it in many cases. Presumably the price would come down in mass application.