LDAP Query in Active Directory - NPS Network Policy Attribute

Hi Guys,

Does anyone know the best way to search for users in Active Directory (2008) with the attribute "control access through NPS Network Policy" (In user properties > dial In Tab) set too deny?

I've tried to put together an LDAP query to filter users but can't find the relevant attribute to put in, and i'm crap at LDAP query's!

Any help would be great guys.

Thanks,
Andrew