Historical clue formulations

• Under the counter, say — 2024-04-14
• Bootleg, e.g. — 2024-01-24
• More than discouraged — 2021-10-09
• Against the law — 2020-11-09
• One caught by border patrol — 2012-02-16
• Criminal — 2011-09-16
• Law-breaking — 2010-02-22
• Like icing — 2008-12-13
• Prohibited — 2004-12-20
• Criminal — 2001-12-12
• Like some aliens — 1999-04-03
• Not according to Hoyle — 1998-08-16