SB 2172 clarifies the authority of the chief appraiser of an appraisal district to require property owners receiving a residence homestead exemption to confirm their qualification for the exemption. The bill restricts chief appraisers from requiring new applications unless they have reason to believe that the property owner no longer qualifies. If a chief appraiser seeks reapplication, they must send written notice stating the specific reason for their belief. Additionally, the bill prohibits chief appraisers from canceling exemptions for property owners aged 65 or older without following specific procedural requirements.