" A young guy in the White House pulled up stop-and-search rates from another pile of policing data. He discovered that a black person in a car was no more likely to be pulled over by the police than a white person. The difference was what happened next. “If you’re black, you’re way more likely to get searched,” said DJ. But then he noticed another pattern: not all cops exhibited the same degree of racial bias. A few cops in one southern city were ten times more likely than others to search a black person they had pulled over. Right there in the White House, the young researcher showed the data to the city’s police chief. “He genuinely had no idea,” said DJ. “He was like, ‘Can you please tell me more?’”
In the end, even DJ Patil was shocked by the possibilities that lurked in the raw piles of information the government had acquired. "

― Michael Lewis , The Fifth Risk: Undoing Democracy