(1) As used in this section: (a) "First responder" has the same meaning as in KRS 507.070, and includes a probation or parole officer, university police officer, and airport police officer; and (b) "Harass" means to intentionally engage in a course of conduct directed at a first responder which causes or is intended to cause substantial emotional distress in the first responder and serves no legitimate purpose. (2) A person is guilty of impeding a first responder when, after receiving a verbal warning not to approach from another person he or she knows or reasonably should know is a first responder who is engaged in the lawful performance of his or her duties, the person knowingly violates the verbal warning and approaches or remains within twenty-five (25) feet of the first responder with the intent to: (a) Impede or interfere with the first responder's ability to perform the first responder's duties; (b) Threaten the first responder with physical harm; or (c) Harass the first responder. (3) Impeding a first responder is a: (a) Class B misdemeanor for the first offense; (b) Class A misdemeanor for a second or third offense; and (c) Class D felony for each subsequent offense.