About 90 of the one in six, if I read that correctly, don't even live in the San Diego county.
the article is at http://www.utsandiego.com/news/2013/mar/26/tp-sheriff-grows-take-home-auto-program/
Why would they? They get to drive a govt vehicle home, they get the gas for free, and expense the entire commute.
http://www.utsandiego.com/video/play/53813/ for a video recap of the article
Must be nice to be driving a cop car, not even a chance of getting a ticket, and not have to think about how much driving costs you... because it doesn't. And your private vehicle? Less miles, less use, less insurance costs to you.
Nice "benefit" perk