Okla. Stat. tit. 13, § 13-131: Liability for loss or injury - Exceptions

Unless the consignor accompanies the freight and retains

exclusive control thereof, a common carrier of property is liable,

from the time that he accepts until he relieves himself from

liability as hereinafter provided, for the loss or injury thereof

from any cause whatever, except:

1. An inherent defect, vice or weakness, or a spontaneous

action, of the property itself.

2. The act of a public enemy of the United States, or of this

state.

3. The act of the law; or,

4. Any irresistible superhuman cause.