Springfield is the third and current capital of the US state of Illinois and the county seat of Sangamon County with a population of 116,250 (U.S. Bureau of the Census, 2010), making it the sixth most populated city in the state and the second most populated Illinois city outside of the Chicago Metropolitan Area. Just over 208,000 residents live in the Springfield Metropolitan Statistical Area, which includes Sangamon County and adjacent Menard County. Present day Springfield was first settled in the late 1810s, around the time Illinois became a state. The most famous past resident is Abraham Lincoln, who lived in Springfield itself from 1837 until he went to the White House in 1861. Major tourist attractions include a multitude of historic sites connected with Lincoln. In 1908 a large race riot erupted in the city which culminated in the lynching of two African American residents and led to the founding of the NAACP.

The city lies on a mostly flat plain which encompasses much of the surrounding countryside. There is more hilly terrain near the Sangamon River. Lake Springfield, a large artificial lake owned by City Water, Light & Power company called CWLP, supplies the city with recreation and drinking water. Weather is fairly typical for middle latitude locations, with hot summers and cold winters. Spring and summer weather is like that of most midwestern cities; severe thunderstorms are common. Tornadoes hit Springfield in 1957 and 2006.

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A police officer (also known as a policeman or policewoman, and constable in some forces, particularly in the United Kingdom and other Commonwealth nations) is a warranted employee of a police force. In the United States, "officer" is the formal name of the lowest police rank; in many other countries "officer" is a generic term not specifying a particular rank, and the lowest rank is often "constable". Police officers are generally charged with the apprehension of criminals and the prevention and detection of crime, and the maintenance of public order. Police officers may be sworn to an oath, and have the power to arrest people and detain them for a limited time, along with other duties and powers.

Some police officers may also be trained in special duties, such as counter-terrorism, surveillance, child protection, VIP protection, and investigation techniques into major crime, including fraud, rape, murder and drug trafficking.

Responsibilities of a police officer are varied, and may differ greatly from within one political context to another. Typical duties relate to keeping the peace, law enforcement, protection of people and property, and the investigation of crimes. Officers are expected to respond to a variety of situations that may arise while they are on duty. Rules and guidelines dictate how an officer should behave within the community, and in many contexts restrictions are placed on what the uniformed officer wears. In some countries, rules and procedures dictate that a police officer is obliged to intervene in a criminal incident, even if they are off-duty. Police officers in nearly all countries retain their lawful powers, while off duty.