Okla. Stat. tit. 21, § 21-1726: Mercury - Possession of more than one pound without

written evidence of title - Penalty - Defenses.

A. Any person who may be found in this state with more than one

(1) pound of mercury in his possession, and who does not have valid

written evidence of his title to such mercury, shall be guilty of a

Class D1 felony offense and upon conviction thereof shall be

punishable by imprisonment as provided for in subsections B through

F of Section 20N of this title, or by a fine not exceeding Five

Hundred Dollars ($500.00), or by both such fine and imprisonment.

B. It shall be a defense to any charge under this section that

the person so charged (1) is a bona fide miner or processor of

mercury or (2) that the mercury possessed by such person is, while

in his possession, an integral part of a tool, instrument, or device

used for a beneficial purpose. In any complaint, information, or

indictment brought under this section, it shall not be necessary to

negative any exception, excuse, exemption, or defense provided in

this section, and the burden of proof of any such exception, excuse,

exemption or defense shall be upon the defendant.