Maryland Code, General Provisions § 5-870

(a) The County Council may enact a local law to regulate the participation of a member of the County Council or the County Executive in any legislative action relevant to a zoning change or amendment, or to a land use application that is before the Office of Planning and Zoning or the Department of Inspections and Permits, if the member of the County Council or the County Executive accepts or has accepted, or as a candidate accepted, a campaign contribution from an individual or a business entity involved with the action or application.

(b) The County Council may enact a local law to prohibit or otherwise regulate campaign contributions made to, or for the benefit of, a member of the County Council, the County Executive, or a candidate for election to the County Council or County Executive by an individual or a business entity involved with a legislative action relevant to a zoning change or amendment, or to a land use application that is before the Office of Planning and Zoning or the Department of Inspections and Permits.