Yes you can.  In the Default Domain Policy simply brose to this path: Computer Configuration\Windows Settings\Security Settings\Public Key Policies\Encrypting File System.  Right click the Encrypting File System and select Properties.  From here you can disable EFS for your users.  Below is a more in-depth article.
http://www.windowsecurity.com/articles/Controlling-Encrypting-File-System-EFS-Group-Policy.html
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