The guidelines followed at the deferred inspection site are largely the same as those followed by the officers at the port of entry, and are described in the U.S. Customs and Border Protection's Inspector's Field Manual.
[1] The officer at the port of entry should consider the following when making a decision to defer inspection:[1] Common reasons for deferred inspection include situations where a Lawful Permanent Resident is believed to have been outside the United States for over 180 days, or cases where the alien is believed to have committed a crime that makes the alien inadmissible or removable.
[3] The following procedures are followed for deferred inspection:[1] The alien needs to work to acquire all the relevant documentation that needs to be presented to demonstrate admissibility, to show at the onward office.
[1] On CBP's side, the port of entry forwards the alien's file, including a copy of the Form I-546, to the onward office.
[1] Deferred inspection sites also be used by aliens seeking to fix problems with the documents issued to them at the port of entry (specifically, the Form I-94).