determine which network drive is mapped in user computer

hi, 

i have a domain environemnt. I 'd like to determine which network drive is mapped on domain user computer. (i use domain admin account). 

I type : get-wmiobject win32_logicaldisk and use drivetype=4 (netowrk drive) but i have no results (i know the user have some mapped  network drive).

I  use win32_mappedlogicaldisk also and still no results. Please Help..