It's also unclear whether some retailers may not have remitted the full amount of the tax in the first month of implementation, Mr. Roose said, and seasonal factors can play a role on alcohol sales.
Md. increase in alcohol tax revenue in for July →
"It's the first month of a new tax so all sorts of things could have happened, and we are trying not to draw too many conclusions from that number," Mr. Roose said. "People may have stocked up in June knowing that the tax was coming."