[nraynaud]

Of course there are explicit policies, here is an example: https://www.federalregister.gov/documents/2016/11/18/2016-27...

[raincom]

Thanks. That's for EADs. USCIS is even delaying interviews on purpose without any written policy. That's what I mean.

[nraynaud]

yes, there are policies on positions, I have also heard of lies at the border by CBP officers (around I-20). The interview process for green card itself is also a delaying tactic.