Invalidation of Labor Certification by the DHS/Consulate (USCUS) is rare. At least two types of invalidations have occurred recently, both by the Nebraska Service Center of the USCIS. Authority can be traced to the regulations at 20 C.F. R. § 656.30(d): (d) Invalidation of labor certifications. After issuance, a labor certification may be revoked by ETA using [...]