(a) As used in this section:

(1) "Driver" means the operator of a school bus; and

(2) "School bus" means any publicly or privately owned motor vehicle designed for transporting ten (10) or more passengers and operated for the transportation of children to or from school or a school activity.

(b) A person over eighteen (18) years of age is guilty of a Class B misdemeanor if the person:

(1) Enters a school bus with the intent to commit a criminal offense;

(2) Enters a school bus and disregards an order or instruction of the driver;

(3)

(A) Enters a school bus and refuses to leave the school bus after being ordered to leave by the driver.

(B) Subdivision (b)(3)(A) of this section does not apply if the person being asked to leave is:

(i) A law enforcement officer acting within the scope of his or her authority as a peace officer; or

(ii) Authorized by the school district to board the school bus as:

(a) A student; or

(b) An individual employed by the school district or volunteering as a participant in a school activity;

(4) Intentionally causes or attempts to cause a disruption or an annoyance to another person on the bus; or

(5) Recklessly engages in conduct that creates a substantial risk of creating apprehension in any person on the bus.

(c)

(1) Any school district or private school shall cause a sign to be placed on any school bus next to any entrance on the school bus warning that unauthorized entry of a school bus is a violation of state law.

(2) The absence of a clearly legible sign on any school bus or next to any entrance on the school bus warning that unauthorized entry of a school bus is a violation of state law is not a defense to a violation of this section.