Here’s what can go wrong when the government builds a huge database about Americans

The National Crime Information Center database, maintained by the FBI, provides law enforcement agencies across the country with information they need to do their job, including information about outstanding arrest warrants, gang memberships, firearms records, and much more. According to the AP, it serves 90,000 agencies and receives 9 million data points every day.

The New York Police Department says one of its detectives was recently caught using the NCIC database to secretly obtain personal information about two other NYPD officers. Police officials have suggested that the man, who also hacked into several individuals’ e-mail accounts, was trying to figure out “who his ex-girlfriend, also a police officer, was chatting with.”