A number of comments come to mind on this issue.
Lots of people here seem to feel that there's no "need" for a police department to own an M2. As someone who actually owns a Ma Deuce, I naturally have to wonder if those same people feel the same way about my possession of the same weapon. Either there's a double standard (which must be properly validated), or else it naturally follows that they feel I shouldn't own one either.
On a personal level, I'm a firm believer in being the absolutely best-armed and equipped as possible. I can't really fault a police department for sharing the same sentiment as myself. If I could acquire an M113 with M2 for $2k/year, I'm pretty sure I'd go for it too (although maintenance and storage could be problematic). There may very well never be any need for it, but Burt's old mantra comes to mind: better to have it and not need it than need it and not have it.
From a purely tactical point of view, I also suspect that many of the objections raised here are based on erroneous perceptions of what the weapon can do. Yes, .50 BMG is highly prone to ricochet, and has a maximum flight distance of over 4 miles-but only when fired at a 30-degree angle into the air, without obstruction. And yes, .50 BMG is capable of penetrating approximately 2-4 feet through the ground, the better part of a foot through concrete, and a significantly long ways through wood/drywall construction. With that being said, and with the acknowledgement that a cartridge with that much muzzle energy is quite capable of defying expectations, there likely
are valid scenarios that can be concieved where the necessity of a .50 BMG would outweigh the negligible safety concerns. Both the southernmost and northernmost parts of Richland County would appear to be fairly sparsely populated. While civilian ranges generally require a five mile runoff behind the line for safety reasons, in the event of a life-threatening situation where .223 rifle fire proves ineffective, it seems plausible that a legitimate decision might be made to employ a heavier caliber with only a mile or two runoff behind the target.
While different in several respects, it's worth noting that Knob Creek has operated for years with full-auto .50 BMG on a regular basis, and has houses only a mile or so downrange on the other side of the hill:
http://maps.google.com/maps?f=q&hl=...854,-85.893345&spn=0.016874,0.027466&t=h&z=15
On the other hand, I'm still a firm believer that the people should not fear the government, but that the government should fear the people. In that regard, I'm completely fine with the Sheriff's acquisition of armored vehicles, so long as the balance of power may legally be maintained and the private citizen is allowed to possess even heavier ordnance. I just wish it were easier to handload for recoilless rifles.