BENICIA -- A Benicia elementary school teacher has been arrested on suspicion of feeding her colleagues food laced with the active chemical in marijuana at a potluck, police said.

Teresa Gilmete Badger, 47, was arrested on Friday around 1:52 p.m. after a months-long investigation stemming from a potluck in late November where several of Badger's colleagues fell ill, said Benicia police Lt. Frank Hartig.

Badger, a teacher at Matthew Turner Elementary School, brought an undisclosed type of food to an after-hours potluck dinner at a colleague's home on Nov. 21, Hartig said. Later in the evening, several guests reported feeling sick, saying they thought they may be under the influence of something.

Within hours, Hartig said, two women were taken to hospitals for treatment. One woman who had blood work done learned she had THC in her system. THC, or Tetrahydrocannabinol, is the main psychoactive component in marijuana.

A younger family member of one of the attendees also reported feeling ill after they ate some of the leftovers brought home after the party.

On Dec. 4, the police department was notified by Benicia Unified School District Superintendent Janice Adams of the incident, and detectives later determined Badger was the person responsible for bringing the cannabis-laced food to the party.

Police were told that Badger had allegedly confessed what she had done to some who were at the party, but remained silent when arrested at her home Friday afternoon.

Badger has been booked into the Solano County Jail in Fairfield and is being held on $15,000 bail.

Superintendent Janice Adams said Badger has been a teacher at the district for 18 years, and was placed on administrative leave due to the investigation. The district has arranged for a substitute teacher for Badger's class, Adams added.

The Vallejo Times-Herald contributed to this report. Follow Katie Nelson at Twitter.com/katienelson210.