Atkins v. Parker
In Atkins v. Parker, 472 U.S. 115, 105 S.Ct. 2520, 2529, 86 L.Ed.2d 81 (1985), an amendment to the Food Stamp Act reduced the amount of earned income which would be disregarded in determining eligibility for food stamps.
The amendment had the effect of reducing the benefit levels for some persons and of altogether extinguishing the entitlement of others who had previously qualified to receive the benefits.
The Court in Atkins held that absent some identified defect in the legislative process, a legislature has the power to modify or rescind property interests previously conferred.