Md. Code, Commercial Law § 11–604

Unless taken with the written consent of the owner, each of the following actions by any person, other than the person whose mark is on the container, is presumptive evidence of a violation of this subtitle:

(1) Use of a marked container;

(2) Possession of a marked container; or

(3) Purchase of a marked container for:

(i) The sale of liquefied petroleum gas; or

(ii) The filling or refilling of the container with liquefied petroleum gas.