The post office across from 180 Varick -- saturation hq -- is more than a post office. The floors above have "hearing rooms" for INS detainees. (Can't call them court rooms -- the INS has no judicial power.) Super secret stuff; there are other such facilities -- and detention facilities, too --around the country. Jenny Polak and Lauren Gill render these spaces, through reports from within. The grey lady has fuller coverage.