You may not yet know that you need an expert witness? But, in a public hearing before a Board of Liquor License Commissioners, expert witness testimony often is admitted when the Board determines that the testimony will assist it, as the trier of fact, to understand the evidence or to determine a fact in issue.
A liquor license requires a location in a proper zoning district.
An August 22, 2017 decision by the Howard County, Maryland Board of Appeals Hearing Examiner is both a detailed exposition of a liquor store as a permitted use under the zoning regulations and a wonderful treatise on the broader topic of land use law