Eighth Circuit: Daniel Ayala v. CyberPower Systems (USA), Inc.

Compensation agreement voidable only for cause was, as a matter of law, insufficient to overcome the state presumption of employment at will, as it didn't specifically address the point.

Dissent: Matter for the finder of fact.

http://media.ca8.uscourts.gov/opndir/18/06/171852P.pdf