California Evidence Code Sections 660-668

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660.
The presumptions established by this article, and all other
rebuttable presumptions established by law that fall within the
criteria of Section 605, are presumptions affecting the burden of
proof.

662.
The owner of the legal title to property is presumed to be the
owner of the full beneficial title. This presumption may be rebutted
only by clear and convincing proof.

663.
A ceremonial marriage is presumed to be valid.

664.
It is presumed that official duty has been regularly
performed. This presumption does not apply on an issue as to the
lawfulness of an arrest if it is found or otherwise established that
the arrest was made without a warrant.

665.
A person is presumed to intend the ordinary consequences of
his voluntary act. This presumption is inapplicable in a criminal
action to establish the specific intent of the defendant where
specific intent is an element of the crime charged.

666.
Any court of this state or the United States, or any court of
general jurisdiction in any other state or nation, or any judge of
such a court, acting as such, is presumed to have acted in the lawful
exercise of its jurisdiction. This presumption applies only when the
act of the court or judge is under collateral attack.

667.
A person not heard from in five years is presumed to be dead.

668.
An unlawful intent is presumed from the doing of an unlawful
act. This presumption is inapplicable in a criminal action to
establish the specific intent of the defendant where specific intent
is an element of the crime charged.