LOS ANGELES POLICE DEPARTMENT
This is pure research and will not be updated with other additions to the mix later into the story. But whenever I need a name for a detective or a FBI agent, I will first look through this list I created when I first had the idea for Ben's story
Where possible, I will cite shows (SWAT = S, R = The Rookie) and episodes for one-off characters... I don't know why I even bothered
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HQ
Chief of Police: Chief Trent Williams
PR Department (PRD): unnamed head (close to retirement) / Whitman, retires chapter 9, Linda O'Reilly (assistant to head)
Internal Affairs Department (IAD): Percy West (chief), Det Emily Barrett
Force Investigation Department (FID): Sgt Forest Penner (OC)
Bomb Squad: Sergeant Reggie Knowles (S S1E3)
Admin: Cpt Evans
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METRO S.W.A.T. (only from the show SWAT)
Commander Robert Hicks
Captain Jessica Cortez [until end of SWAT S2]
Support: Officer Rubina Haider (Tech), Dr Wendy Hughes (psych)
20-David: Buck Spivey (20-D, retired) - Daniel 'Hondo' Harrison (20-D) - Dominique Luca (22-D) - Christina Alonso (24-D) - Victor Tan (25-D) - Jim Street (26-D) - David 'Deacon' Kay (30-D)
50-David: Jeff Mumford (50-D), Donovan Rocker (51-D), Wilson Stokes (54-D, OC)
60-David: Sgt Becker (60-D), Lee Durham (63-D) [until SWAT S4E15 / terminated (racism)]
70-David: Sgt Stevens (70-D)
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BUREAU OF DETECTIVE SERVICES
SUPPORT & VICE: Det Sampath, Det Murphy [R], Mark Miller [R]
GANG & NARCOTICS: Alexander Rios, Elijah Vestri [R], Kevin Wolfe [R], Elena Ruiz [R]
COMMERCIAL: Dave Delgado [R], Bill Summerland [R],
ROBBERY-HOMICIDE (RHD): John Burrows, Det Billings, Sarah Hunter [unnamed in show, actress Sarah Haruko], Det Boyde, Det Nick Armstrong [until Rookie S3E1 / dead]
MAJOR CRIMES: Jennifer Paige [R], Sanford Motta [R], Det Sgt. Ryan Caradine [R], Rita Calderon [R],
Ava Ilic (undercover S S3E9)
Erin Cole (patrol officer Hollywood Division R S2E18-20 -> Ruben Derian [Derian Crime Family] / Nick Armstrong)
Officer Doug Stanton [R] (S3E2 transfers over from Valley Bureau)
Detectives without clear distinction on where they are:
Det Barker (? S S2E9), Det Ramona Quinn (? S S6E10), Det Sal Marcus (? S S1E3), Det Branson (?), Det Olivia Barlow (? S S5E12), Det Schumacher (? S S3E19), Det Ben Rose (? S S1E14), Det Fraley (? S S1E15), Det Ferris (?)
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DEPARTMENT OF HOMELAND SECURITY
Agent Jessica Russo [R]
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FEDERAL BUREAU of INVESTIGATION
Special Agent Wyck Bird [R S2E5], Special Agent Walter Reynolds [R S4E4], Special Agent Casey Fox [R S4E19], Agent in Training Simone Clark [R S4E19]
Agent Gines
Agent Ellen Benson
Agent Simons
Agent Abby Dubois
Agent Phil Kaminski
Agent Elle Trask (anti-terrorism)
Special Agent Alan Ritter (?)
Agent Phillips (?)
Agent Valdez (?)
Agent Floyd (?)
Agent Prebble (?)
Agent Bashir (?)
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DEA
Agent Mack Boyle
Special Agent Katrina 'K.C.' Walsh [retired S1]
Agent Cho
Agent Lyons
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CIA
Agent Bishop
Agent Devereaux