Dawn Giannini who is married to a US Army Lt Col has been arrested and charged with incest after a pupil recognized the teacher performing in a video on a porn website.
The teen who spotted the teacher in the raunchy clip online had been looking at PornHub. The student noticed the youngster partnering the teacher in the clip was a classmate. in fact an underage female family member, it is claimed.
They then alerted the school’s principal, who called police, which resulted in Giannini’s arrest on October 18.
Giannini, 49, who is married to Thomas Giannini, a US Army Lieutenant Colonel,  was a fourth grade teacher at St. Elizabeth Seton Catholic School in Palo Alto, in 2015. She had been working for the school district since 2007.
The mother-of-two from Palo Alto remains in custody while the investigation continues.

Before that, she was a special education assistant and substitute for the Redwood City School District.
Redwood City School District Superintendent John Baker sent out an email to parents about Giannini and said while it is believed she did not assault a student, the information is still ‘truly heartbreaking.’
The videos document sexual acts that allegedly spanned a year. Giannini is accused of having a sexual relationship with the underage family member from November 2014 until November 2015.
San Mateo County District Attorney Steve Wagstaffe would not identify how Giannini and the young girl, who was 14 at the time of the crimes, were related.
Giannini is alleged to have recorded some of the sexual interactions, which were then later uploaded onto the PornHub website. – Prosecutors believe the teen posted the video.

Her husband, Thomas, is a high-ranking military officer who has had three overseas deployments to Iraq and Afghanistan.
He also has proven leadership experience as a company commander, Battalion Operations Officer and most recently as an Area Office Officer-In-Charge coordinating several Afghanistan Infrastructure Projects in remote locations, while serving in an active combat zone.

‘We know the victim was sexually active, and there were a lot of videos that were uploaded,’ Wagstaffe said.
‘We know that this occurred in at least two counties. It occurred here in our county, in Redwood City and there was a trip down to Santa Cruz that she took with the victim and there was sexual activity there.’
It is not believed that Giannini acted inappropriately with any of her students, however the DA is still investigating all aspects of the case.
Giannini has since been fired from the Redwood City School District and will not be able to work at the district ever again.
She appeared in court on Thursday and did not enter a plea, Wagstaffe said. She remains in jail in lieu of $1.75 million bail.
She is expected to return to court on November 5.