JOSHUA -- A 12-year-old Joshua school district student faces a charge of assault on a public servant after being accused of slipping a chemical into a teacher's drink, authorities said.
The incident happened Tuesday at Plum Creek Elementary School.
The boy admitted to investigators that he put a substance in a teacher's beverage, but his reasons are unclear, said Capt. Mike Gilbert of the Johnson County Sheriff's Department.
Authorities believe that the substance is sodium carbonate, often used in detergents, and that it came from a science kit. Ingestion can cause stomach upset and nausea, Gilbert said.
The sixth-grade teacher called in sick Wednesday. She was off work Thursday on a personal day unrelated to the illness. She returned Friday and took her students on a field trip, district Superintendent Ray Dane said.
"Apparently, she's fine. I'm just really glad the teacher is doing well and is back at work," Dane said. "Hopefully there will be some lessons learned from this."
The teacher, whom Gilbert declined to identify, has worked in the district for 30 years.
The boy is being held at the Hood County Regional Juvenile Center.
Assault on a public servant is a third-degree felony, Gilbert said.
Jessamy Brown, 817-390-7326