After Ferguson, a noticeable gap in criminal-justice statistics emerged: the use of lethal force by the police. The federal government compiles a wealth of data on homicides, burglaries, and arson, but no official, reliable tabulation of civilian deaths by law enforcement exists. A partial database kept by the FBI is widely considered to be misleading and inaccurate. (The Washington Post has just released a more expansive total of nearly 400 police killings this year.) “It’s ridiculous that I can’t tell you how many people were shot by the police last week, last month, last year,” FBI Director James Comey told reporters in April.
This raises an obvious question: If the FBI can’t tell how many people were killed by law enforcement last year, what other kinds of criminal-justice data are missing? Statistics are more than just numbers: They focus the attention of politicians, drive the allocation of resources, and define the public debate. Public officials—from city councilors to police commanders to district attorneys—are often evaluated based on how these numbers change during their terms in office. But existing statistical measures only capture part of the overall picture, and the problems that go unmeasured are often also unaddressed. What changes could the data that isn’t currently collected produce if it were gathered?