From Clarin:
In an effort to identify and address irregularities within the federal benefits system, the US Social Security Administration (SSA) has launched in-person checks targeting retirees, pensioners and recipients of federal benefits. …
In-person checks are not random, nor do they cover the entire retiree population. Instead, they primarily target recipients of two programs: Supplemental Security Income (SSI) and Social Security Disability Insurance (SSDI).
Furthermore, checks are triggered when SSA systems detect discrepancies in reported data, mismatches between tax records and actual income, or address changes that were not reported within required deadlines. …
Some may remember the old centenarian project at Social Security. Agency employees were sent out supposedly to congratulate those turning 100. The purpose was actually to make sure the claimants were still alive.
I guess that employees will attend to this chore in their spare time.