"wall street journal" reporter rob barry joins us now. so, how did you do your reporting and what did you find? >> thanks for having me. what we did was we asked about 105 departments to give us the number of people who have been killed over a five- or six-year period, and we compared those number to what had been reported to the f.b.i. and we found that there was a lot of stuff that wasn't in the f.b.i.'s information. >> sreenivasan: you said at least 550 police killings between 2007 and 2012 never made it on to the books? >> yeah, and that's only among the top 105, 110 largest agencies in the country. so there are 18,000 jurisdictions, so, you know, that's just a small estimate of the total. >> sreenivasan: okay, so, for example, some jurisdictions could call something a justifiable homicide versus an unjustifiable homicide, discrepanciediscrepancies in de? what do you mean? >> it was a wide range of things. that was certainly one of the issues. what we're dealing with here are essentially crime reports and agencies who are forced to re