South Dakota Codified Laws
Chapter 03 - Powers Of Agent
Section 59-3-2 - Actual authority defined.

59-3-2. Actual authority defined.
Actual authority is such as a principal intentionally confers upon the agent, or intentionally or by want of ordinary care, allows the agent to believe himself to possess.

Source: CivC 1877, §1355; CL 1887, §3978; RCivC 1903, §1674; RC 1919, §1256; SDC 1939, §3.0202.