Wipe FileVault 2 Drive

I'm trying to completely wipe and reinstall Mountain Lion on an employee's laptop who has left. Disk utility won't let me wipe the drive unless I give it the decryption password. Is there a way to completely erase the volume to reinstall the OS?

It should be possible to delete/reformat the partition via command line in the recovery OS.
Use instead of disk3 in the example below your disk, should be disk0 in a single disk config.
I assume you have either a system which can boot via network from apple or you have the possibility to boot via an USB drive (with MLion) on it.
How to generate a MLion USB stick: http://www.macrumors.com/2012/07/25/create-a-bootable-mountain-lion-usb-key-inst aller/ 
diskutil eraseDisk
Usage:  diskutil eraseDisk format name [[APM]Format|[MBR]Format|[GPT]Format]
        MountPoint|DiskIdentifier|DeviceNode
Completely erase an existing whole disk.  All volumes on this disk will be
destroyed.  Ownership of the affected disk is required.
Format is the specific filesystem name you want to erase it as (HFS+, etc.).
Name is the (new) volume name (subject to filesystem naming restrictions),
or can be specified as %noformat% to skip initialization (newfs).dis
You cannot erase the boot disk.
Example: diskutil eraseDisk JHFS+ UntitledUFS disk3

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