You need to sue to get it back. Even if the trial is acquitted. It's a major source of revenue for police. It's one reason why they're becoming more and more militarized.
New Yorker Article: http://www.newyorker.com/magazine/2013/08/12/taken
New Yorker Article: http://www.newyorker.com/magazine/2013/08/12/taken
In essence, their hand is forced to take the gift. There's been backlash about this.
http://rt.com/usa/186788-police-weapons-military-grants/
http://www.bostonglobe.com/news/nation/2014/08/23/obama-orde...