It's a matter of policy of that particular policing agency, so that may be an agreement. A given policing agency will decide that for a call of domestic violence or assault or what have you, as a matter of policy they will instruct their communications operators to make that check. In many cases that police officer will not have the knowledge that the check is being conducted on his or her behalf, because there was a policy decision by that chief and his management team.
On September 26th, 2006. See this statement in context.