Maryland Code, Natural Resources § 4-1018

(a) The Department may adopt regulations governing the size, type, and use of containers used to measure oysters harvested or sold in the State.

(b) Due to the quantity of water contained in measures of newly shucked oysters, any proprietor or manager of a plant, house, or establishment shall measure oysters as received from the shuckers in a special gallon cup which contains no more than 9 pints. Any device other than this 9 pint gallon cup may not be used to measure any oysters received from shuckers. A Natural Resources police officer shall stamp every 9 pint gallon measure used in measuring newly shucked oysters. A proprietor or manager of any house, plant, or establishment which shucks oysters shall have every 9 pint gallon measure stamped.

(c) Every shucked oyster sold in the State shall be sold by the standard United States one-half pint, pint, quart, or gallon liquid measure, or by fractions or multiples of these liquid measures.