USCIS - USCIS Announces Resumption of Premium Processing ...
Only those petitioners who have successfully passed an on-site inspection are ... may choose to submit a copy of Form I-797 approval notice for the previously ...
http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=8b3dcb29f99b2210VgnVCM100000082ca60aRCRD&vgnextchannel=c94e6d26d17df110VgnVCM1000004718190aRCRD