... isn't known (link). Another is Deborah Weissman of the University of North Carolina at Chapel Hill School of Law; she collaborated with the ACLU of NC to produce an anti-287g report (link). From the American side, one of those testifying for the program is described here.
[1] blogs.phoenixnewtimes.com/bastard/2009/04/house_judiciarys_witness_list.php