Had It in Holland Park

How many older inmates deliberately commit the crimes to get the free healthcare?

Probably because the Asian kids are the only ones bright and persistent enough to figure out how to do it.

"an analysis of more than 80 cases" out of 80 thousand. At this sampling rate, I'd suspect a large margin of error in any statistics.

Nevertheless, the study shows that tagging works as a method of triage; separating those who obey society's rules from the scoff-laws. 

An interesting study would be to compare the sentencing authority's predictions of who will violate the tagging scheme. If they match the actual violators fairly well, then judicial discretion would be an even cheaper method of triage.