Sentence:  These borderlines are outnumbered more than five to one by the "<WSD>blottos</WSD>," drivers with BACs [blood alcohol concentrations] of 0.20 and higher. Put this 0.08 idea to the commonsense test: "We're going to improve highway safety with a program aimed at a few "borderlines," while five times as many "<WSD>blottos</WSD>" continue their boozy ways? It'll never work." 
Meaning of the word marked with <WSD> tags:  A person who is (very) drunk or intoxicated.