The purpose of the study was to learn the extent to which retail grocers, defined as "vendors" in the WIC Program, authorized to provide food to WIC participants, were violating program rules and procedures, and to determine which programmatic and/or demographic variables could be associated with vendor violations.

This study was the first in a series of studies that estimated the extent of retailer-level SNAP benefit trafficking. The major findings included large stores having only half the store violation rate that smaller stores had. Additionally, the overall benefit trafficking rate was 13.0% as compared to 1.3% in the latest trafficking rate study.