One legal issue is in regard to the mandatory labeling on food containers identifying if that product is genetically modified. In the GMO labeling bill that congress passed, food companies must disclose GMOs but without necessarily using a GMO label on packaging. Companies have several disclosure options, including using a QR code on packaging that customers could then scan with a smartphone to learn more. Some do not think that this bill is sufficient for what they are asking for. Those who demand GM food be labeled, argue that the bill does not allow the customer to easily read if a food is genetically modified or not. In contrast, food companies and farm groups say that pro-labeling groups are trying to use labels to drive consumers away from GMOs - a tactic that worked in Europe.