How to Audit USB Access in Windows XP

Hi All,

I am working as a system administrator...around with 90 systems..

As per company Rules all the usb ports of client systems are blocked through GPO...

I noticed one user is access the usb port...because he took the data from home and copy those data into local hard drive of

office system without intimate me...

How is it possible...Because i checked his port..it is blocked..how is he access Usb port...

Is there any way to track the usb access and track which files he copied from usb to local drive and vice-versa...

Are it is possible to track the usb access through Batch file...

Please help me....

thanks in Advance....
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