Which of the following can a marijuana establishment not do under compliance regulations?

Answer: B — Alter products after packaging

A marijuana establishment is prohibited from altering products after packaging due to compliance regulations aimed at maintaining product integrity and safety. Once a product has been packaged, it is important that it remains in its original state to ensure that consumers receive what has been accurately tested and labeled. This restriction helps prevent any addition of unauthorized substances or changes that could compromise the quality and safety of the product. Maintaining consistency is crucial for consumer trust and regulatory compliance; therefore, any alterations post-packaging could lead to potential contamination, mislabeling, or unintended effects on the product's potency and efficacy. It is important that all products sold to consumers have undergone strict quality control and testing prior to packaging, ensuring they are safe and as represented.