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A female school teacher has been accused of having sex with a 12-year-old boy and giving him marijuana.

Katerina Bardos, 24, allegedly had a long-term relationship with the pupil, who is half her age, and even slept with him in a school car park.

Investigators said the relationship started when the boy was in Miss Bardos's sixth-grade class at Brentwood Middle School, Colorado, US.

Miss Bardos admitted to supplying marijuana for the teen, but denied to police any sexual relationship with the boy, according to Fox31.

Police said Miss Bardos moved to Frontier Charter School in Autumn 2014 and allegedly continued the relationship with the boy until just before her arrest.

The boy, now 13, told police he had sex with his teacher more times than he could count, even in the car park of her new school.

She faces charges of sex assault on a child, sex assault on a child by some one in a position of trust and contributing to the delinquency of a minor.

She was initially arrested for contributing to the delinquency of a minor and the sexual nature was revealed after her arrest.

The Greeley-Evans School District said: "Katerina Bardos was a teacher at Brentwood Middle School from August 2013 through May 2014. Her contract was not renewed at the end of May 2014.

"The only alleged male victim in this case is a student at Brentwood Middle School. Greeley-Evans School District 6 personnel are cooperating with the Greeley Police Department investigation of these allegations."

A statement from Miss Bardos new school, Frontier, said: "The employee has been terminated. As termination is a personnel matter, we will not make any further comment."

She is expected to appear in court on May 18.