South Dakota Codified Laws
Chapter 06 - Relationship Between Principal And Third Persons
Section 59-6-3 - Principal bound by acts of agent under ostensible authority.

59-6-3. Principal bound by acts of agent under ostensible authority.
A principal is bound by acts of his agent under ostensible authority, to those persons only who have in good faith, and without negligence, incurred a liability or parted with value upon the faith thereof.

Source: CivC 1877, §1370; CL 1887, §3993; RCivC 1903, §1689; RC 1919, §1271; SDC 1939, §3.0303.

See Cal Civ Code, §2334.