perl and ldap at the same time??

["Oguzhan Kayhan" <oguzhank@bilkent.edu.tr>]

Hello,
I wonder if i can make a dual authentication check via freeradius.
I am using rlm_perl right now for our accounting needs.
What i want is to add LDAP auth. Ofcourse i can add this function to perl
script that i write but, it is better to use freeradius ldap function.
So, is it possible to check ldap if the username not accepted in rlm_perl?
Or only one option can be used for authentication?