A state bureau of investigation (SBI) is a state-level detective agency in the United States. They are plainclothes agencies that usually investigate criminal cases involving the state and/or multiple jurisdictions. They also typically provide technical support to local agencies in the form of laboratory and/or record services, or to directly assist in the investigation of cases at the local agency's request.
The Department of Public Safety of the State of Texas, commonly known as the Texas Department of Public Safety (DPS), is a department of the state government of Texas. The DPS is responsible for statewide law enforcement and driver license administration. The Public Safety Commission oversees the DPS. However, under state law, the Governor of Texas may assume command of the department during a public disaster, riot, insurrection, formation of a dangerous resistance to enforcement of law, or to perform his constitutional duty to enforce law. The commission's five members are appointed by the governor and confirmed by the Texas Senate, to serve without pay for staggered, six-year terms. The commission formulates plans and policies for enforcing criminal, traffic and safety laws, preventing and detecting crime, apprehending law violators, and educating citizens about laws and public safety.
The Pennsylvania State Police (PSP) is the state police agency of the U.S. state of Pennsylvania, responsible for statewide law enforcement. The Pennsylvania State Police is a full service law enforcement agency which handles both traffic and criminal law enforcement. The Pennsylvania State Police was founded in 1905 by order of Governor Samuel Pennypacker, by signing Senate Bill 278 on May 2, 1905. The bill was signed in response to the Great Anthracite Strike of 1902. Leading up to the Anthracite Strike, private police forces were used by mine and mill owners to stop worker strikes. The inability or refusal of local police or sheriffs' offices to enforce the law directly influenced the signing of Bill 278. The Anthracite Strike lasted from May 15 to October 23, 1902, and was ended with the help of Theodore Roosevelt, the sitting president at the time.
The West Virginia State Police (WVSP) is a state law enforcement agency in the United States that provides police services to the residents of West Virginia. It is the fourth-oldest state police agency in the US. The WVSP was disbanded due to their involvement in quelling of the uprisings on behalf of the coal and mine companies which were surrounding the concept of organized labor in the coal and mine industries. The WVSP was then reorganized as the Department of Public Safety in the second extraordinary session of the West Virginia Legislature on June 19, 1919, as a result of their involvement.
The Alaska State Troopers, officially the Division of Alaska State Troopers (AST), is the state police agency of the U.S. state of Alaska. It is a division of the Alaska Department of Public Safety (DPS). The AST is a full-service law enforcement agency that handles both traffic and criminal law enforcement. The AST is also involved in apprehending fugitives as part of the Alaska Fugitive Task Force, an inter-agency collaborative of Alaska police departments that cooperates with police agencies throughout the United States and less commonly with Interpol in apprehending wanted men and women. Unlike many lower 48 states, the AST also serves as Alaska’s primary environmental law enforcement agency; troopers assigned to the AST’s Division of Alaska Wildlife Troopers are known as "Alaska Wildlife Troopers" and primarily serve as game wardens, although they retain the same powers as other Alaskan state troopers.
The New Jersey State Police (NJSP) is the official state police force of the U.S. state of New Jersey. It is a general-powers police agency with statewide jurisdiction, designated by troop sectors.
The Michigan State Police (MSP) is the state police agency for the U.S. state of Michigan. The MSP is a full-service law enforcement agency, with its sworn members having full police powers statewide.
The Delaware State Police (DSP) is a division of the Delaware Department of Public Safety and Homeland Security and is responsible for traffic regulation and law enforcement across the US State of Delaware, especially in areas underserved by local police departments. The DSP is headquartered in the capital Dover, Delaware.
The Washington State Patrol (WSP) is the state patrol agency for the U.S. state of Washington. Organized as the Washington State Highway Patrol in 1921, it was renamed and reconstituted in 1933. The agency is charged with the protection of the Governor of Washington and the grounds of the Washington State Capitol; security aboard the vessels and terminals of the Washington State Ferries; law enforcement on interstate and state highways in Washington; and providing specialized support to local law enforcement including laboratory forensic services, mobile field forces during periods of civil unrest or disaster, and tactical teams. The State Fire Marshal's Office, responsible for operation of the Washington State Fire Training Academy and for certain aspects of civil defense mobilization, is a component office of the Washington State Patrol, and the State Patrol is the managing agency of the Washington Fusion Center, which coordinates anti-terrorist and anti-organized crime activities within Washington.
The Wisconsin State Patrol is the state patrol for the state of Wisconsin and is a division of the Wisconsin Department of Transportation. The Wisconsin State Patrol enforces traffic and criminal laws, oversees the motor carrier safety and weight facilities (SWEFs), inspects and regulates motor carriers, school buses and ambulances, and assists local law enforcement agencies with traffic safety, civil disturbances and disasters.
The Florida Highway Patrol (FHP) is a division of the Florida Department of Highway Safety and Motor Vehicles. It is Florida's highway patrol and is the primary law enforcement agency charged with investigating traffic crashes and criminal laws on the state's highways.
The Maryland State Police (MSP), officially the Maryland Department of State Police (MDSP), is the official state police force of the U.S. state of Maryland. The Maryland State Police is headquartered at 1201 Reisterstown Road in the Pikesville CDP in unincorporated Baltimore County.
The Illinois State Police (ISP) is the state police agency of the U.S. state of Illinois. The Illinois State Police is responsible for traffic safety on more than 300,000 miles of total roadway, including 2,185 miles of interstate highways and 15,969 miles of state highways. Currently, almost 3,000 sworn and civilian personnel make up the Illinois State Police.
The Oklahoma Highway Patrol (OHP) is a major state law enforcement agency of the government of Oklahoma. A division of the Oklahoma Department of Public Safety, the OHP has traffic enforcement jurisdiction throughout the state. OHP was legislatively created on July 1, 1937, due to the growing problem of motor vehicle collisions, the expansion of highway systems, and the increase in criminal activities.
The Texas Highway Patrol is a division of the Texas Department of Public Safety and is the largest state-level law enforcement agency in the U.S. state of Texas. The patrol's primary duties are enforcement of state traffic laws and commercial vehicle regulation, but it is a fully empowered police agency with authority to enforce criminal law anywhere in the state. Also, they respond to emergencies on Texas’s highways. Highway patrol troopers are also responsible for patrolling the state Capitol Complex in Austin and providing security to the governor. The current Chief is Lieutenant Colonel Dwight Mathis.
The Indiana State Police is the statewide law enforcement agency for the U.S. state of Indiana. Indiana was the 12th state to offer protection to its citizens with a state police force.
The Maine State Police (MSP) is the state police agency for Maine, which has jurisdiction across the state and was created in 1921.
The Ohio State Highway Patrol is a division of the Ohio Department of Public Safety and has the primary responsibility of traffic enforcement in the U.S. state of Ohio.
In the United States, the state police is a police body unique to each U.S. state, having statewide authority to conduct law enforcement activities and criminal investigations. In general, state police officers or highway patrol officers, known as state troopers, perform functions that do not fall within the jurisdiction of a county’s sheriff, such as enforcing traffic laws on state highways and interstates, overseeing security of state capitol complexes, protecting governors, training new officers for local police forces too small to operate an academy and providing technological and scientific services. They also support local police and help to coordinate multi-jurisdictional task force activity in serious or complicated cases in states that grant full police powers statewide.
On March 7, 2006, Joseph Erin Hamley, an unarmed man, was fatally shot by Arkansas State Trooper Larry P. Norman of West Fork, Arkansas. At 7 a.m. on March 7, 2006, Hamley, who had cerebral palsy, was walking alone on U.S. Route 412, just outside the community of Tontitown along the Benton-Washington county line when several Washington County deputies surrounded him. Four minutes later, before being identified, and while lying on the ground, a shotgun slug fired by Norman, an Arkansas State Trooper breaking police protocol and procedure killed Hamley. The fatal shooting was recorded from multiple vantage points on dashboard cameras of the various police cruisers present. Norman was indicted on and pled guilty to negligent homicide.
Arkansas 
