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 the subsequent arrest would violate the Fourth Amendment. Our interviews with command staff and officers indicate that officers do not clearly understand the legal authority necessary to issue a wanted. For example, one veteran officer told us he will put out a wanted "if I do not have enough probable cause to arrest you." He gave the example of investigating a car theft. Upon identifying a suspect, he would put that suspect into the system as wanted "because we do not have probable cause that he stole the vehicle." Reflecting the muddled analysis officers may employ when deciding whether to issue a wanted, this officer concluded, "you have to have reasonable suspicion and some probable cause to put out a wanted."

At times, FPD officers use wanteds not merely in spite of a lack of probable cause, but because they lack probable cause. In December 2014, a Ferguson detective investigating a shooting emailed a county prosecutor to see if a warrant for a suspect could be obtained, since "a lot of state agencies won't act on a wanted." The prosecutor responded stating that although "[c]hances are" the crime was committed by the suspect, "we just don't have enough for a warrant right now." The detective responded that he would enter a wanted.

There is evidence that the use of wanteds has resulted in numerous unconstitutional arrests in Ferguson. Internal communications reveal problems with FPD officers arresting individuals on wanteds without first confirming that the wanteds are still valid. In 2010, for instance, an FPD supervisor wrote that "[a]s of late we have had subjects arrested that were wanted for other agencies brought in without being verified first. You guessed it, come to find out they were no longer wanted by the agencies and had to be released." The same supervisor told us that in 2014 he cleared hundreds of invalid wanteds from the system, some of them over ten years old, suggesting that invalid wanteds have been an ongoing problem.

Wanteds can also be imprecise, leading officers to arrest in violation of the Fourth Amendment. For example, in June 2011, officers arrested a man at gunpoint because the car he was driving had an active wanted "on the vehicle and its occupants" in connection with an alleged theft. In fact, the theft was alleged to have been committed by the man's brother. Nonetheless, according to FPD's files, the man was arrested solely on the basis of the wanted.

This system creates the risk that wanteds could be used improperly to develop evidence necessary for arrest rather than to secure a person against whom probable cause already exists. Several officers described wanteds as an investigatory tool. According to Chief Jackson, "a wanted allows us to get a suspect in for booking and potential interrogation." One purpose, he said, is "to conduct an interview of that person." While it is perfectly legitimate for officers to try to obtain statements from persons lawfully detained, it is unconstitutional for them to jail individuals on less than probable cause for that purpose. Dunaway, 442 U.S. at 216. One senior supervisor acknowledged that wanteds could be abused. He agreed that the potential exists, for example, for an officer to pressure a subject into speaking voluntarily to avoid being arrested. These are risks that the judicially-reviewed warrant process is meant to avoid.

Compounding our concern is the minimal training and supervision provided on when to issue a wanted, and the lack of any meaningful oversight to detect and respond to improperly issued wanteds. Some officers told us that they may have heard about wanteds in the training academy. Others said that they received no formal training on wanteds and learned about them