Pair had sex in multiple places including on school grounds and field trips

Authorities say relationship with the victim began when he was just 14

having sex with a student was posted on social media, police say

A married teacher has been arrested after a sex tape allegedly showing her having sex with a 15-year-old high school student was passed around the school.

Charlaina Lee Wilson, 33, of Knoxville, Alabama, is charged with rape, sodomy, transmitting obscene material to a child by computer and distributing material harmful to minors, according to Selma police.

Authorities say Wilson had sex with the student multiple times at different locations - including school grounds and on field trips. The relationship is thought to have been going on for a year.

Charlaina Lee Wilson (left and right, on her arrest) is charged with rape, sodomy, transmitting obscene material to a child by computer and distributing material harmful to minors,

Detectives say Wilson (pictured with her husband) was caught after a parent spotted her sex tape on her child's social media and contacted the principal

The 33-year-old agricultural teacher quit her job at Selma High School in Alabama, just eight months after she began when the offences came to light, according to WALB.

Police say that the obscene footage featured Wilson performing a solo sexual act and had been sent to the student she was having sex with.

It only came to light after it was posted on social media - racking up thousands of views as kids at the high school passed it around.

The video was reported to the principal by a concerned parent who saw the video on their child's social media account.

Two students had also come forward to alert the school administrators.

Selma High School principal alerted the police on Thursday who obtained the sex tape and interviewed Wilson and several students.

The former teacher was arrested last Friday and is now being held on a bond of more than $1 million.

Authorities say Wilson had sex with the student multiple times at different locations and believe their relationship continued for a year

The 33-year-old agricultural teacher (pictured with her husband James) quit her job at Selma High School in Alabama, just eight months after she began when the offences came to light

Detectives say the video was made several months ago but had only surfaced in the past few days.

'If it wasn't for this video, it wouldn't have come to light. I'm told the video has been circulated by a large amount of students over at Selma High School on Facebook and other social media sites,' Police Chief Brock told WSFA.

'Last I heard, there was over 10,000 hits on one of the sites. She sent it to the student she was involved with.

'She had a sexual relationship with one student. We know of one student over there. He's now 15 but this relationship sounds like it's been going on since he was 14.'

Selma investigators indicated Wilson had sex with the student multiple times and at different locations.

Brock says Wilson could face charges in other jurisdictions because her alleged sexual encounters with the teenager took place on school grounds, as well as on field trips.

Wilson was arrested last Friday (pictured) and is currently being held on more than $1million bail

She previously taught near Knoxville, Alabama, where she lives, according to police.

Wilson's husband James refused to speak to DailyMail.com.

Dr. Angela Mangum, superintendent of Selma City Schools, released a statement on Friday saying Wilson's behavior 'is not aligned with the values, core beliefs, and mission of our district.'

'Once the incident was reported, swift and immediate action was taken to remove the teacher from the school to ensure the safety of students. As the superintendent, it is my responsibility to protect all students from harm. I will not tolerate any misconduct towards students, and I will promptly act in their defense.

Dallas County District Attorney Michael Jackson confirmed that Wilson could be facing a lengthy prison term if convicted.

The investigation is ongoing and detectives will be interviewing several more students.

Authorities say Wilson had sex with the student on the school grounds of Selma High School (pictured)

Chief Brock called the case 'disturbing.'

'Every couple of weeks, you see where a teacher is involved with a student somewhere in the state or even across the southeast. It's getting out of hand in some places,' he said.

Only last week, in Houston, Drew Dillon Watson, 30, was arrested after he allegedly traveled across state lines to have sex with a 15-year-old boy he had been talking with via text message and video chat.