Examples of states having these include Texas, Minnesota, Tennessee, Arizona, Alabama, Oklahoma, and South Carolina.
Many local jurisdictions (cities and counties), and special districts (schools and hospitals) have the umbrella configuration described above, in which the DPS is simply a joint administration of several distinct agencies.
They may share administrative support staff and back-office functions, but sworn personnel remain specialized and have particular responsibilities (that is, the police continue to arrest people and the firefighters put out fires).
In these unusual organizations, all full-time sworn personnel are cross-trained as police officers, firefighters and EMTs, and can respond to emergencies in any capacity.
[2] This configuration was more widely popular in the 1970s and 1980s in the United States but has since gone out of style because relatively few cities have been able to execute it successfully because of manpower limitations in handling major incidents.