(510 ILCS 70/3.09)
    Sec. 3.09. Carbon monoxide euthanasia by a licensed veterinarian. A licensed veterinarian may euthanize a companion animal in a commercially manufactured chamber by use of compressed carbon monoxide. The veterinarian must be physically present during the euthanasia process until death is confirmed. The veterinarian must take all of the following steps when using a gas chamber:
        (1) Render a written opinion for each companion
    
animal including:
            (A) a description of the animal including
        
species, color, age, sex, and microchip number if present; and
            (B) a signed and dated statement that the use of
        
compressed carbon monoxide is the most humane method of euthanasia for this companion animal.
        (2) Use a commercially manufactured chamber pursuant
    
to the guidelines set forth in the most recent report of the AVMA Panel on Euthanasia. The interior of the chamber must be well lit and equipped with view-ports, a regulator, and a flow meter. Monitoring equipment must be used at all times during the operation. Animals that are under 4 months of age, old, injured, or sick may not be euthanized by carbon monoxide. Animals shall remain in the chamber and be exposed for a minimum of 20 minutes. Staff members shall be fully notified of potential health risks.
        (3) Only one companion animal may be euthanized at a
    
time.
(Source: P.A. 96-780, eff. 8-28-09.)