Hey Cook I am glad you brought that up. What these larger dispensaries do is hire a private security firm, that has guns. these guys are expensive though and only the largest dispensaries can afford them. Some of the shadier places in East LA form example, reach out to the locals (the gangs) who watch out for them for an under the table percentage. these are the dispensaries that the government is targeting.

Honestly, if I pick up a larger amount I carry my gun with me. Many of these places are in sketchy neighborhoods and I know people that have gotten jacked coming out with their "meds."