We also depend on good inputs. For example, we don't currently ask about immigration status, but we can provide information for caseworkers to use so that they correctly count the number of household members when doing a screening. If a family neglects to report an income source--that will affect benefit eligibility (and the Food Stamp office won't forget to ask about all income sources!).
If you do a screening with a family and find a discrepancy, please let us know! We'd love to fix it!