Okla. Stat. tit. 85A, § 85A-66: Silicosis and asbestosis

A. As used in this act, unless the context otherwise requires:

1. "Asbestosis" means the characteristic fibrotic condition of

the lungs caused by the inhalation of asbestos dust; and

2. "Silicosis" means the characteristic fibrotic condition of

the lungs caused by the inhalation of silica dust.

B. In the absence of a preponderance of the evidence in favor

of the claim, disability or death from silicosis or asbestosis shall

be presumed not to be due to the nature of any occupation within the

provision of this section unless during the ten (10) years

immediately preceding the date of disablement the employee has been

exposed to the inhalation of silica dust or asbestos dust over a

period of not less than five (5) years, two (2) years of which shall

have been in this state, under a contract of employment performed in

this state. However, if the employee has been employed by the same

employer during the entire five-year period, his or her right to

compensation against the employer shall not be affected by the fact

that he or she had been employed during any part of the period

outside of this state.

C. Except as otherwise provided in this section, compensation

for disability from uncomplicated silicosis or asbestosis shall be

payable in accordance with the provisions of Sections 45 and 48 of

this title.

D. 1. In case of disability or death from silicosis or

asbestosis complicated with tuberculosis of the lungs, compensation

shall be payable as for uncomplicated silicosis or asbestosis,

provided that the silicosis or asbestosis was an essential factor in

the causing of disability or death.

2. In case of disability or death from silicosis or asbestosis

complicated with any other disease, or from any other disease

complicated with silicosis or asbestosis, the compensation shall be

reduced as provided in subsection C of Section 65 of this title.