HURST, Texas -- A North Texas teenager has been arrested for allegedly putting bleach into another student's soda.

Katherine Smith, 18, turned herself in to the Tarrant County Jail. She faces a felony charge of tampering with a consumer product.

"(The alleged victim) noticed that the seal was already broken and then she went ahead and opened it and smelled it and thought it smelled unusual and she was suspicious of the contents," said Judy Ramos, a spokeswoman for the Hurst-Euless-Bedford Independent School District.

The 16-year-old alleged victim, who was the star in the school play, did not take a drink of the Mountain Dew, but instead went to the principal's office.

Police said Smith was the understudy and wanted the lead role, and they believe she tainted the soda with bleach.

Investigators said lab tests came back positive for byproducts of bleach.

Detectives issued an arrest warrant a week ago.

Smith is free on $2,500 bond. If convicted, Smith could face 20 years in prison.

School officials said Smith was placed in an alternative school and was barred from the senior prom and graduation ceremony.