Excluding users or groups from being monitored?

Is there a way in Websense to exclude groups of users from being monitored like the "Unmonitored Users" feature in Surfcontrol and still allow policy processing to take place?

Basically we have a ton of training clients that we don't want showing up in our reporting or monitoring but still want filtering applied and Surfcontrol offered the unmonitored users feature but I can't find something similar in Web Security.