Establishes that, before signing a purchase agreement to sell or transfer residential property, an individual or entity issued a broker's real estate license by the Indiana real estate commission representing a seller shall ensure that the seller: (1) provides a radon warning statement to the buyer; (2) discloses in writing to the buyer any knowledge the seller has of radon concentrations in the dwelling; and (3) provides the buyer with a guide on radon, testing, and mitigation published by the Indiana department of health.