Historical clue formulations

• Bug — 2020-08-23
• Bug — 2020-07-19
• Listen here! — 2019-09-06
• Relative of a bug — 2015-11-01
• Invasive bug — 2015-10-28
• Criminal's worry — 2009-03-01
• Conversation piece? — 2007-12-08
• Surveillance setup — 2007-07-07
• Bug — 2005-01-04
• Relative of a bug — 2004-07-17
• Subject of a court order — 2003-10-25
• Listen in on — 2002-11-27
• Spy's device — 2002-04-02
• Bug a phone — 2001-11-14
• This is a recording — 2000-02-18
• Act of law enforcement — 1996-09-01
• Eavesdrop, in a way — 1994-10-27
• Listen in on — 1994-02-03