No dealer is subject to any penalty of this subtitle for advertising, selling, offering or exposing for sale, or transporting for planting purposes in the State any sod or mixture in violation of §§ 9-104 and 9-105 of this subtitle, if he:

(1) Has obtained from his supplier an invoice, grower’s declaration, or other labeling information relating to the sod or mixture; and

(2) After having taken reasonable precautions to insure its veracity, has relied in good faith upon any statement made or contained in the invoice, grower’s declaration, or labeling information in advertising, selling, or offering or exposing for sale the sod or mixture.