Major Case Squad
| Alton Police Department | Alton Southern Railroad Police |
| Arnold Police Department | Ballwin Police Department |
| Bel Ridge Police Department | Bel-Nor Police Department |
| Bellfountaine Neighbors Police | Belleville Police Department |
| Berkeley Police Department | Bond County Sheriff's Department |
| Breckenridge Hills Police | Brentwood Police Department |
| Bridgeton Police Department | Cahokia Police Department |
| Calverton Park Police | Centerville Police Department |
| Charlack Police Department | Chesterfield Police Department |
| Clayton Police Department | Collinsville Police Department |
| Columbia Police Department | Cool Valley Police Department |
| Crestwood Police Department | Creve Coeur Police Department |
| Crystal City Police Department | Dellwood Police Department |
| Des Peres Police Department | Desoto Police Department |
| East St. Louis Police Department | Edmundson Police Department |
| Ellisville Police Department | Eureka Police Department |
| Fairmont City Police Department | Fairview Heights Police Department |
| Ferguson Police Department | Festus Police Department |
| Florissant Police Department | Florissant Valley Community College |
| Franklin County Sheriff's Department | Frontenac Police Department |
| Glen Carbon Police Department | Glendale Police Department |
| Granite City Police Department | Greenville Police Department |
| Hazelwood Police Department | Herculaneum Police Department |
| Highland Police Department | Illinois State Police Department |
| Jefferson County Sheriff's Department | Jennings Police Department |
| Kirkwood Police Department | Ladue Police Department |
| Madison County Coroner | Madison County Sheriff's Department |
| Madison Police Department | Manchester Police Department |
| Maplewood Police Department | Maryland Heights Police Department |
| Maryville Police Department | Mascoutah Police Department |
| Millstadt Police Department | Missouri State Highway Patrol |
| Moline Acres Police Department | Monroe County Sheriff's Department |
| New Athens Police Department | Normandy Police Department |
| Northwoods Police Department | O'Fallon, Illinois Police Department |
| O'Fallon, Missouri Police Department | Olivette Police Department |
| Overland Police Department | Pevely Police Department |
| Pontoon Beach Police Department | Richmond Heights Police Department |
| Riverview Police Department | Rock Hill Police Department |
| S.I.U.E. Police Department | Sauget Police Department |
| Shrewsbury Police Department | St. Ann Police Department |
| St. Charles Police Department | St. Charles County Sheriff's Department |
| St. Clair County State's Attorney | St. Clair County Coroner |
| St. Clair County Sheriff's Department | St. John Police Department |
| St. Louis Metropolitan Police | St. Louis County Police Department |
| St. Peters Police Department | Sullivan Police Department |
| Sunset Hills Police Department | Swansea Police Department |
| Town and Country Police Department | Troy, Illinois Police Department |
| U.M.S.L. Police Department | United States Marshal's Service |
| Union Pacific Railroad Police | University City Police Department |
| Vinita Park Police Department | Warren County Sheriff's Department |
| Warrenton Police Department | Warson Woods Police Department |
| Washington Police Department | Waterloo Police Department |
| Webster Groves Police Department | Wentzville Police Department |
| Wood River Police Department | Woodson Terrace Police Department |