Kenneth Alarcon had a bad feeling as he and a friend left the restaurant. He noticed two figures following closely behind, and suddenly there was a gun in his face.
"Give me all your stuff or I'll shoot you," a voice commanded.
Alarcon emptied his pockets and turned over a wedding band that belonged to his grandmother.
Don't look at me, one of the two assailants warned as he snatched the ring. "I will kill you!"
And then the gunmen were gone, leaving Alarcon and his companion face down on the dirty sidewalk just south of downtown Minneapolis. Police arrived minutes later and a description of the suspects given by the shaking Alarcon led to arrests and robbery charges.
But that was not the end of this case. When it went to trial last summer, the defense argued that police ignored basic photo lineup science, broke department policies and coached Alarcon into picking the suspect they wanted — claims police denied in court and in recent interviews.
Debates over the reliability of eyewitness memory rarely make it to trial in Minnesota, but a growing body of scientific research is driving law enforcement agencies across the country to adopt new policies designed to reduce the chances of wrongfully identifying an innocent person. The Department of Justice requires all federal agents to follow procedures based on this science, such as recording the confidence of a witness directly after the lineup, and not months later in court, when the memory is more likely to fail. Many states, from Wisconsin to Texas, have passed laws mandating scientific procedures.
Minnesota has no statewide policy, and most police agencies have no written policy at all, according to a 2016 survey conducted by the Minnesota Chiefs of Police Association.