Child abuse, homicides, robberies, drug trafficking, gang violence, sexual crime - it can be a long and difficult litany of crime and punishment.
Omaha Police Sgt. Jeff Baker, a member of St. Vincent de Paul Parish in Omaha, said it took more than a year, but family and friends, faith and frequent confessions helped him learn to forgive after Robbie Hawkins shot and killed eight people and wounded four before killing himself four years ago in the Von Maur store at Westroads Mall in Omaha.
"I was the third man in the door that day," Baker said. "The scene was the worst I have ever taken in during 23 years as a police officer. I had a murderous feeling toward Robbie Hawkins."
Trying to understand the demons that drove Hawkins also helped, he said.
"I had to confess a lot of times," he said. "And during confession, I believe there is a grace you receive."
Now, Baker said, he prays for Hawkins.
"The moment that bullet passed through his brain, I hope and pray that he had a moment of repentance, and now he is in heaven on his knees, praying for those he hurt and the families of those he killed," Baker said.
To help keep faith foremost in his mind, Omaha Lt. Gregg Barrios takes time about once a week while supervising officers on patrol to visit a church and light a candle, pray or attend Mass.
"If I can keep God in my life, at work, at play, I can be a better police officer, a better father and a better husband," said Barrios, a member of Church of the Holy Spirit Parish in Plattsmouth.
Yanez said faith enters conversations among officers who are struggling, and even when police question suspects.
"'What do you think God was thinking?'" Yanez said he might ask a suspect during an interrogation. People with some religious feeling often reflect, he said, and sometimes confess to a crime.
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"'I won't do this for you,' they might say, 'but I'll do this for God.'"
Yanez, who now works at police headquarters and helps investigate crimes on the north side of Omaha, wore a medal of St. Michael, the patron saint of police officers, while working on the street as part of the narcotics unit several years ago. Suspects would sometimes comment on the medal, he said.
"I'd tell them I'm a Catholic and I believe I'm here to protect people from what you're doing," Yanez said, adding that it was time he got back to wearing that medal.
Sgt. Alan Reyes, 43, said his Catholic faith has helped him through 17 years as an Omaha police officer, including his own crisis - chemotherapy 12 years ago for cancer of the lymph system - as well as challenges at work.
Early in his career, Reyes said, a suspect died while he and other officers were trying to arrest him. A grand jury investigation found for the police, and a wrongful death lawsuit against the officers failed.
But it was stressful, said Reyes, a member of Holy Rosary Parish in Glenwood, Iowa.