Historical clue formulations

• *Riot dispersal weapon — 2019-11-11
• Anti-mob tool — 2018-03-11
• Lachrymatory agent — 2016-11-12
• March interrupter, maybe — 2016-10-01
• Cause of a stinging breakup? — 2014-10-04
• Riot control agent — 2010-12-11
• Demonstrating control? — 2010-05-28
• Cause of temporary blindness — 2008-03-29
• Blind, in a way — 2007-01-13
• Nonlethal weapon — 2003-11-28
• It's enough to make you cry — 2001-01-14
• Riot remedy — 1998-05-08
• March ender, maybe — 1997-03-16
• Quell, as rioters — 1995-10-15
• Demonstration halter — 1995-07-23