A blue law is a type of law, typically found in the United States and Canada, designed to enforce religious standards, particularly the observance of Sunday as a day of worship or rest, and a restriction on Sunday shopping. Most have been repealed, have been declared unconstitutional, or are simply unenforced; though prohibitions on the sale of alcoholic beverages or prohibitions of almost all commerce on Sundays are still enforced in many areas. Blue laws often prohibit an activity only during certain hours and there are usually exceptions to the prohibition of commerce, like grocery and drug stores. In some places blue laws may be enforced due to religious principles, but others are retained as a matter of tradition or out of convenience.^[1]