Hello! I came across your post and wanted to direct you towards a comic book issued at P.S.C. Norman that details the rules and expectations for those passing through. Called "Here's How" and drawn by a H.Phares (who I'd like to know more about), I'm not sure of its publication date. You can download the comic as a pdf file from here: http://contentdm.unl.edu/cdm4/item_viewer.php?CISOROOT=/comics&CISOPTR=88&CISOBOX=1&REC=20
Click on the cover to begin the download. Hope this helps answer some of your questions on how people were processed through there. cheers!