(KTVU-TV) A 59-year-old preschool teacher has been arrested on child endangerment charges for allegedly putting an unknown substance into the drinking cups of her young students.

Morgan Hill police said Deborah Gratz, of Hollister, had been arrested after Kiddie Academy preschool officials reported that she had put Sominex — an over the counter sleeping aid — into the drinking cups of some of the children on Friday March 8, 2013.

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