and advertises bids for major county purchases and contracts. The commission is also empowered to audit and approve claims against the county, propose county bonds, and audit the accounts of all other county offices. The board's other duties include the maintenance of traffic control devices, the power to approve zoning applications, and the administration of federal funds provided to the county. Only the board may purchase equipment, machinery, supplies, or materials of any kind for the county, and all contracts and agreements relating to the leasing or rental of county equipment or otherwise relating to the business of the county are negotiated by the commission. It is in the name of the county commission that the county sues and is sued. The board meets on or before the first Monday of each month and may stay in session for as long as the commission determines. However, the board must adjourn by the last business day of each month. Should the board adjourn before the last business day of a month, the county clerk may call the board into a special session. Meetings of the board are open to the public. The County Sheriff is the chief law enforcement officer in the county and peace officer. The sheriff must be at least 25 years old, have been a resident of Oklahoma for two years, a qualified elector in the county, and possess at least a high school diploma. In counties with over 80,000 citizens, the sheriff must be a certified peace officer at the election. However, in counties with under 80,000 citizens, the sheriff is given up to 12 months after the election to become certified. When it comes to the responsibilities of the sheriff, Oklahoma's outlaw history has bestowed the sheriff with what is seen as full services, that is, providing traditional law-enforcement functions, including countywide patrol and investigations irrespective of municipal boundaries. As the chief peace officer, the sheriff is responsible for ensuring the peace is preserved, riots are suppressed, and that unlawful assemblies and insurrections are controlled. The sheriff is vested with the power to form a posse of able-bodied men to assist him in controlling riots and lawlessness. The sheriff also serves as the executor of court orders and other lawful authorities within the county. To ensure justice is administered, the sheriff is empowered to apprehend any person charged with a felony or breach of the peace