An agent can never have authority, either actual or ostensible, to do an act that is and is known or suspected by the person with whom the agent deals to be a fraud upon the principal.
Mont. Code Ann. § 28-10-409
No authority to defraud principal
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.