Focus on the Cole Memo priorities. For example, observe that they are not letting in minors, checking for IDs, asking for medical cards, etc. Look for product labels that state the products should not be consumed prior to driving, or kept away from minors. Observe the volume of sales being conducted, and compare to deposit volumes for reasonableness. For example if there were 1-2 sales of say $50 a piece while you were there, does that jive with $150k in deposits for a day? Make sure sales are occurring through the front door with all the protections, and not around back.
I know this is a late reply, but I just joined the forum and saw your question. Hope this helps!