Unlike most of the country, Maryland consumers can't purchase alcohol at grocery stores. Maryland's alcohol distribution is governed by a 1978 law that explicitly denies alcohol licenses to chain and discount stores, poorly defined, and limits licenses to Maryland residents, who can only hold one license.
Grocery stores, drug stores, convenience stores, etc. DO NOT sell liquor, only beer and wine. Liquor stores are open Monday-Saturday from 10am-9pm; note: all liquor stores are closed on Sunday. Beer and wine can be purchased in stores between 12pm and 12am.