I want a policy to trigger when a user logs in to a machine for the first time (imagine a new user getting a new computer). I don't want the policy to ever trigger on machines that are already existing in the JSS, only a machine that has been recently given to a new user (or a machine that has just had the Casper agent installed for the first time). I'm basically trying to have all new imaged machines execute a FileVault encryption policy, but I don't want it to go to any of my existing 10.8 users.
Currently I'm running Casper Suite 8.6 and I'm really only concerned about targeting Mountain Lion systems.
