[j_baker]

Perhaps that was the point. Someone may not want this job to be filled for whatever reason?

[robertfw]

I would say it was the point, but not for the shady reason you think. Rather, it ensures that people applying know what they are getting into immediately. Quite a good pre-filter.

[vubuntu]

It could be a job posting to satisfy the requirements of PERM (http://www.foreignlaborcert.doleta.gov/perm.cfm )