Indiana Code Title 29. Probate § 29-3-11-1

(1) protected as if the guardian or person acting under a protective order properly exercised the power;  and

(2) not required to inquire into the existence of the power or the propriety of its exercise except as to restrictions endorsed on the letters.

(1) extends to any procedural irregularity or jurisdictional defect occurring in proceedings under this article;  and

(2) is not a substitution for but is in addition to any other applicable law, including the laws relating to commercial transactions and to simplifying transfers of securities by fiduciaries.