Law Enforcement (LE)

Police / Law Enforcement (LE) sniper rifles are somewhat another kind of tools. If in most military/war scenarios wounded enemy is equivalent to killed enemy, or even better, in LE and counter-terrorist (CT) scenarios wounded criminal or terrorist may lead to many innocent victims. Sometimes, the LE or CT sniper must not only kill the terrorist, but hit the particular part of the body - head, or hand, holding the gun, etc. So, in general, LE and CT sniper rifles require more accuracy, but at shorter distances. The majority of LE or CT scenarios require precision shooting at the distances lesser that 300, or even 100 meters. These scenarios also require really few shots per scenario - sometimes one and the only one shot. This also require extreme accuracy and stability of results in any weather conditions. LE and CT snipers also has no limitations on caliber and ammunition selection, so they could select almost any caliber/cartridge they department want, or can afford.
Usually, LE/CT sniper rifles had completely ajustable stocks to suit snipers of different statute, sometimes they got half-of-dozen ajustable screws. This is absolutely unsuitable for military sniper rifles, but for LE sniper rifles, which are usually carried to the point of action in special cases, this is OK.
Many USA made LE sniper rifles are built on the hunting "varmint" rifles. Varmint rifles are small or medium caliber hunting rifles, designed to kill small pests, such as squirrels, rabbits etc., at extended distances. Some LE sniper rifles, such as Remington 700 Police, are simply Remington 700VS varmint hunting rifle barreled actions, bedded into sniper-style stocks.
                                                   
In Europe, some sniper rifles built on sniper rifles (such as Mauser 66, SIG-Sauer SSG2000, Blaser R93 Tactical), and some built on hunting rifles (such as Steyr Scout Tactical). LE/CT sniper rifles use many kinds of ammunition, from .22LR for training and short-range sniping, to .308 Win, 6.5x55mm, .300 Win magnum etc.