Pre-School Teacher Allegedly Drugged Kids with Sleeping Pills

California teacher Debbie Gratz allegedly prepped toddlers for naptime with a popular sleep aid.
2:21 | 03/14/13

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Transcript for Pre-School Teacher Allegedly Drugged Kids with Sleeping Pills
This preschool teacher from chafl who said to have prepped her toddlers by giving them sominex. The parents are enraged. She's been arrested. All the details. Reporter: Good morning. It is a parents' worst nightmare. The children involved just 1 to 2 years old. The adult supposed to be looking out for them charged with trying to drug them. This morning police are investigating this woman, 59-year-old debbie grotz caught red-handed alleged ly spiking sippy cups with an over-the-counter drug. At the kiddie academy seeing the suspect place an unknown substance into the children's cups. Reporter: When administrators confronted her friday, police say she admitted it was the sleeping aid sominex but did not explain why she was giving it to the children. She was immediately fired and when police were told about it monday, she was arrested. Best case scenario would have been for us to be called right away and taken a sample or those cups and taken them to the crime lab for analysis. Reporter: Now the question investigators and parents want answered has she done it before and if so how much of the drug could her students have ingested. We were seeing things of irritability and we were seeing symptoms of possibly not sleeping through the night. This actually could have been a side effect from being poisoned. Reporter: The sominex label warns it's not to be used in children under 12. Thankfully these drugs are relatively safe. I would expect that these children will do just fine. Reporter: In a statement to abc news the school says "the actions of this individual are reprehensible. The authorities in this case have our full cooperation and the children, along with their families, co to be our top priority." This morning, many parents are still reeling from the disturbing betrayal of trust. Sickening. Sick to my stomach. I'm not angry. I'm just -- sad. Sad. Disturbing. I don't know what to think. Debbie faces felony charges of child endangerment. The school insists nafis the only incident and the school took charge before they could drink those sippy cups. It's impossible for these parents to ever know for sure possibly. Okay, thanks very much. The weather from sam. Not often you get to see a

This transcript has been automatically generated and may not be 100% accurate.

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