Because they can and because they are rewarded for doing so:
ut are police officers necessarily more trustworthy than alleged criminals? I think not. Not just because the police have a special inclination toward confabulation, but because, disturbingly, they have an incentive to lie. In this era of mass incarceration, the police shouldn’t be trusted any more than any other witness, perhaps less so.That may sound harsh, but numerous law enforcement officials have put the matter more bluntly. Peter Keane, a former San Francisco Police commissioner, wrote an article in The San Francisco Chronicle decrying a police culture that treats lying as the norm: “Police officer perjury in court to justify illegal dope searches is commonplace. One of the dirty little not-so-secret secrets of the criminal justice system is undercover narcotics officers intentionally lying under oath. It is a perversion of the American justice system that strikes directly at the rule of law. Yet it is the routine way of doing business in courtrooms everywhere in America.”The New York City Police Department is not exempt from this critique. In 2011, hundreds of drug cases were dismissed after several police officers were accused of mishandling evidence. That year, Justice Gustin L. Reichbach of the State Supreme Court in Brooklyn condemned a widespread culture of lying and corruption in the department’s drug enforcement units. “I thought I was not naïve,” he said when announcing a guilty verdict involving a police detective who had planted crack cocaine on a pair of suspects. “But even this court was shocked, not only by the seeming pervasive scope of misconduct but even more distressingly by the seeming casualness by which such conduct is employed.”Remarkably, New York City officers have been found to engage in patterns of deceit in cases involving charges as minor as trespass. In September it was reported that the Bronx district attorney’s office was so alarmed by police lying that it decided to stop prosecuting people who were stopped and arrested for trespassing at public housing projects, unless prosecutors first interviewed the arresting officer to ensure the arrest was actually warranted. Jeannette Rucker, the chief of arraignments for the Bronx district attorney, explained in a letter that it had become apparent that the police were arresting people even when there was convincing evidence that they were innocent. To justify the arrests, Ms. Rucker claimed, police officers provided false written statements, and in depositions, the arresting officers gave false testimony.Mr. Keane, in his Chronicle article, offered two major reasons the police lie so much. First, because they can. Police officers “know that in a swearing match between a drug defendant and a police officer, the judge always rules in favor of the officer.” At worst, the case will be dismissed, but the officer is free to continue business as usual. Second, criminal defendants are typically poor and uneducated, often belong to a racial minority, and often have a criminal record. “Police know that no one cares about these people,” Mr. Keane explained.All true, but there is more to the story than that.Police departments have been rewarded in recent years for the sheer numbers of stops, searches and arrests. In the war on drugs, federal grant programs like the Edward Byrne Memorial Justice Assistance Grant Program have encouraged state and local law enforcement agencies to boost drug arrests in order to compete for millions of dollars in funding. Agencies receive cash rewards for arresting high numbers of people for drug offenses, no matter how minor the offenses or how weak the evidence. Law enforcement has increasingly become a numbers game. And as it has, police officers’ tendency to regard procedural rules as optional and to lie and distort the facts has grown as well. Numerous scandals involving police officers lying or planting drugs — in Tulia, Tex. and Oakland, Calif., for example — have been linked to federally funded drug task forces eager to keep the cash rolling in.