Wis. Stat. § 701.1012: Protection of person dealing with trustee.

(1) A person other than a beneficiary who in good faith assists a trustee, or who in good faith and for value deals with a trustee, without knowledge that the trustee is exceeding or improperly exercising the trustee’s powers is protected from liability as if the trustee properly exercised the power.

(2) A person other than a beneficiary who in good faith deals with a trustee is not required to inquire into the extent of the trustee’s powers or the propriety of their exercise.

(3) A person who in good faith delivers assets to a trustee does not need to ensure their proper application.

(4) A person other than a beneficiary who in good faith assists a former trustee, or who in good faith and for value deals with a former trustee, without knowledge that the trusteeship has terminated is protected from liability as if the former trustee were still a trustee.

(5) Comparable protective provisions of other laws relating to commercial transactions or transfer of securities by fiduciaries prevail over the protection provided by this section.