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(A) No person shall knowingly resist or obstruct the performance by one known to the person to be a peace officer, firefighter, or correctional institution employee of any authorized act within his or her official capacity.
(B) For purposes of this section, the term CORRECTIONAL INSTITUTION EMPLOYEE shall mean any person employed to supervise and control inmates incarcerated in a penitentiary, state farm, reformatory, prison, jail, house of correction, police detention area, half-way house, or other institution or place for the incarceration or custody of persons under sentence for offenses or awaiting trial or sentence for offenses, under arrest for an offense, a violation of probation, a violation of parole, a violation of aftercare release, a violation of mandatory supervised release, or awaiting a bail setting hearing or preliminary hearing, or who are sexually dangerous persons or who are sexually violent persons and the term FIREFIGHTER means any individual, either as an employee or volunteer, of a regularly constituted fire department of a municipality, or fire protection district who performs fire fighting duties, including, but not limited to, the fire chief, assistant fire chief, captain, engineer, driver, ladder person, hose person, pipe person, and any other member of a regularly constituted fire department; FIREFIGHTER also means a person employed by the Office of the Stare Fire Marshal to conduct arson investigations.
(ILCS Ch. 720, Act 5, § 31-1) ('74 Code, § 19-17) Penalty, see § 130.99