Historical clue formulations

• Food safety subj. — 2015-12-03
• ___ screen (drug test) — 2015-05-23
• Poison sci. — 2014-10-08
• Study of poisons: Abbr. — 2007-12-02
• Medical examiner's subj. — 2001-08-18
• Poisonous: Prefix — 1998-07-22