106. Burden of proving fact specially within knowledge.
When any fact is specially within the knowledge of any person, the burden of proving that fact is upon him.
(a) When a person does an act with some intention other than that which the character and circumstances of the act suggest, the burden of proving that intention is upon him.
(b) A is charged with traveling on a railway without a ticket. The burden of proving that he had a ticket is on him.