Fortinet Network Device IPS - Manual (Page 15)

IPS overview and general configuration Using IPS sensors in a protection profile
FortiGate IPS User Guide Version 3.0 MR7
01-30007-0080-20080916
15
Adding protection profiles to user groups
When creating a user group, select a protection profile that applies to that group.
Then, when configuring a firewall policy that includes user authentication, select
one or more user groups to authenticate. Each user group selected for
authentication in the firewall policy can have a different protection profile, and
therefore different IPS settings, applied to it.