A chemistry teacher at a Texas high school and her husband, a convicted felon, have been arrested on drug charges.

Haivan Bui, 29, was arrested Friday at Oak Ridge High School, where she'd taught chemistry since last year. Montgomery County Sheriff's deputies said she had recipes for date-rape drugs in her backpack when authorities took her into custody.

Her arrest followed a police raid earlier that day at the home where Bui lives with her husband, 33-year-old Chris Alan Hartwell. Police said Hartwell possessed methamphetamine and gamma-hydroxybutyrate, a compound used in date-rape drugs. The search also turned up a loaded shotgun and additional drug-making recipes, police said.

Police charged Bui with possession with intent to deliver or manufacture a controlled substance. Hartwell faces charges including possession of a controlled substance and felon in possession of a firearm.

The principal of Oak Ridge High School said there is no evidence that any illegal activity took place at the school. Students described Bui as a "good teacher," and were surprised to learn she'd been arrested.

"It was kind of crazy. Everyone was like, maybe it's drugs, and it was," student Armando Sanchez told KHOU.

The couple's neighbors were also shocked to learn of the allegations. Some said they didn't feel safe with an alleged date-rape drug operation in the neighborhood.

"Maybe they're trying to be the new 'Breaking Bad,'" neighbor said Phyllis Hannon told KPRC. "He was a chemistry teacher on the show, too."

The sheriff's office said the investigation is ongoing.