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"But really what it is is a record of crimes that are reported to the police and then those of those crimes that get reported to the FBI. It's not a full record of all violent crimes, and this is a problem. And the FBI is very explicit about this when they present the data in their formal report every year, where they say, Do not directly compare the data from year to year because there are differences in how frequently people report crimes and how frequently the FBI gets that data from the local police agencies