Once a Cop...

21 Jump Street revolves around a group of young cops who would use their youthful appearance to go undercover and solve crimes involving teenagers and young adults.

Rejseholdet is a Danish television crime series starring Charlotte Fich, Mads Mikkelsen and Lars Brygmann. Produced by Danmarks Radio, the program aired 32 episodes spanning four seasons from 2000 to 2004. Each episode revolved around an elite mobile police task force called "Unit One" that travels around Denmark helping local police solve crimes. Cases portrayed in the show were loosely based upon actual incidents of sensational crimes such as murders, kidnappings, cross-border sex traffic and child pornography. Rejseholdet won the 2002 International Emmy Award for best drama series.

This drama follows Inspector Kurt Wallander – a middle-aged everyman – as he struggles against a rising tide of violence in the apparently sleepy backwaters in and around Ystad in Skane, southern Sweden. Based on the international best-selling books by Henning Mankell.

The Killing is a Danish police procedural set in the Copenhagen main police department and revolves around Detective Inspector Sarah Lund and her team, with each season series following a different murder case day-by-day and a one-hour episode covering twenty-four hours of the investigation. The series is noted for its plot twists, season-long storylines, dark tone and for giving equal emphasis to the story of the murdered victim's family alongside the police investigation. It has also been singled out for the photography of its Danish setting, and for the acting ability of its cast.

Teresa flees Mexico after her drug-runner boyfriend is murdered. Settling in Dallas, she looks to become the country's reigning drug smuggler and to avenge her lover's murder.

The story of Jim Worth, an expat British police officer starting a new life with his family as police chief in Little Big Bear, an idyllic town near the Rocky Mountains. When his small town is overrun by migrant workers from a massive new oil refinery – the wave of drugs, prostitution and organised crime that follows them threatens to sweep away everything in its wake.

Karl Alberg moves to a quiet coastal town to soothe a psyche that has been battered by big-city police work but finds himself needing to call upon all his skills to solve the murders that continue to wash up on his shore.

Baretta is an American detective television series which ran on ABC from 1975 to 1978. The show was a milder version of a successful 1973–74 ABC series, Toma, starring Tony Musante as chameleon-like, real-life New Jersey police officer David Toma. While popular, Toma received intense criticism at the time for its realistic and frequent depiction of police and criminal violence. When Musante left the series after a single season, the concept was retooled as Baretta, with Robert Blake in the title role.

Two police officers, the older Lt. Stone and the young upstart Inspector Keller, investigate murders and other serious crimes in San Francisco. Stone would become a second father to Keller as he learned the rigors and procedures of detective work.

Professor Jasper Tempest, a genius Cambridge University criminologist with OCD and an overbearing mother, advises the police. British version of the Belgian crime drama of the same name.

Set in the aftermath of Jax Teller’s death, Ezekiel "EZ" Reyes is fresh out of prison and a prospect in the Mayans M.C. charter on the Cali/Mexi border. Now, EZ must carve out his new identity in a town where he was once the golden boy with the American Dream in his grasp.

Sergeant Thomas Jefferson Hooker is a tough-as-nails veteran police officer with the LCPD who turns his back on a gold badge and goes back to patrolling the streets and training recruits. Along with his young partners in blue, Hooker take on Lake City's toughest criminals.