Police say the 13-year-old girl from Setauket told them that she found the blade in a mini 3 Musketeers bar Thursday night.
Her mother reported it to authorities just after 7:30 p.m.
According to police, the girl had gone out trick-or-treating on Halloween and had also traded candy with her classmates at Paul J. Gelinas Junior High School so, if this is true, it's not clear exactly where the piece of candy might have come from.
GO VOTE | Here's what you need to know to vote early in New York, New Jersey in 2022 election
Early voting begins in NY, NJ Saturday
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