The students allegedly put rat poison in their teacher's water bottle Monday at P.S. 315.
Anna Thomas was arrested after her 19-month-old son, Justin Stephens, was found dead, cops said.
Eric Dancy, 25, was arrested and charged with the February rape, cops say.
A 22-year-old was raped Saturday morning steps away from the CUNY school, according to police.
Francky Aleger, 39, was found with a gunshot wound to his back at East 95th St. and Glenwood Rd.
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