The New Yorker, June 22, 2009 by John Seabrook
http://www.newyorker.com/reporting/2009/06/22/090622fa_fact_seabrook
Franklin Zimring … told me that one reason that Ceasefire’s effectiveness is difficult to predict in any given city is that Kennedy’s results have not been subjected to a rigorous independent analysis. “Ceasefire is more a theory of treatment than a proven strategy,” he said, adding, “It’s odd that no one has ever said, ‘O.K., here are the youths who were not part of the Ceasefire program in Boston, let’s compare them to the youths who were.’ And no one has followed up with any long-range studies of the criminal behavior of the group that was in the program, either. We just don’t have the evidence, and until we do we can’t evaluate how effective Ceasefire really is.”