The IRS? Sure, they’ve got the income taxes of those working on food stamps. They don’t actually track the “food stamps” themselves as income, nor do they tax it, so I’m not sure why you think they have it or even care about it. HHS would be the department you’re thinking of. Guess what? They’re the ones issuing the “food stamps.” They’re also the ones responsible for finding fraud.
No personal information needed. See how that works? And it would be perfectly Constitutional.
This isn’t about obtaining information on the food stamp recipients, it’s about obtaining the data from the major chains where those food stamp dollars are spent in order to see just how much of their profits are coming out of the taxpayer’s pockets and to ensure that those dollars are only being spent on approved items.