Police allege man menaced teacher and conveyed food was contaminated with lead acetate, which can cause irreversible neurological damageAustralia news live: latest politics updatesGet our breaking news email, free app or daily news podcastAn 18-year-old man has been arrested after allegedly menacing a teacher and leading a school community to believe its food had been poisoned with lead acetate, while seeking a ransom of $2.59m.The man was arrested after a “complex investigation” by South Australian police on Wednesday night which involved assistance from federal units including the domestic spy agency, Asio. The man faced an Adelaide magistrates court on Thursday.Sign