A traveller's sobs were left ignored this weekend, as she was subjected to an invasive pat-down despite her cries - in another blow to the TSA.

A video posted to YouTube captures the weeping woman's ordeal during the security checkpoint at an airport in Madison, Wisconsin.

Jim Hoft, who runs the political blog Gateway Pundit, posted the video on the site, as well as YouTube yesterday.

Mr Hoft wrote: 'This morning at a Midwest airport I witnessed this poor woman suffering through this horrible sexual violation'.

It's the latest in a long line of disturbing behaviour during security checkpoints.

Loud sobs can be heard as the woman, wearing a pink sweater, is patted down by a female TSA agent.

The woman's hands are shaking as the agent moves her hands down the woman's legs. The woman is then left alone, and can be seen hunching over, her arms crossed across her body in humiliation.

Last month, a clip on the video-sharing site showed a terrified eight-year-old boy confined to a wheelchair, trembling with fear as he was subjected to an invasive TSA pat-down.

Also last month, a new mom was forced to show security her freshly pumped breast milk before she could board a plane with a breast pump.

In February, a mother claimed she was subjected to repeated body scans after being told by agency employees that she 'had a cute figure'.

These followed incidents last year, where TSA agents allegedly helped themselves to cake in a flier's bag, and confiscated another's cupcake.

In December 2011, not one but two grandmothers came forward to say that they were mortified when they were ordered to be strip-searched during a security screening.

A TSA agent was fired in October after New York writer and lawyer Jill Filipovic found a note in her luggage (which contained a vibrator) that said: 'Get your freak on girl'.

In May 2011, a bizarre photograph showing a baby being frisked by airport security caused outrage after it was posted online.

The Tsa's Greatest Hits: A History Of Bizarre Behaviour

Last month, a YouTube clip showed a terrified eight-year-old boy confined to a wheelchair, trembling with fear as he was subjected to an invasive TSA pat-down as he cries to his dad.

Also last month, new mom Amy Strand was forced to show security her freshly pumped breast milk before she could board a plane with a breast pump.

In February, Ellen Terrell claimed she was subjected to repeated body scans after being told by agency employees that she 'had a cute figure'.

In January, two TSA agents were out of the the job and jailed after they admitted to stealing $40,000 from a checked bag at JFK Airport in New York.

That same month, the agency was forced to apologise after two grandmothers in their 80s were subjected to mortifying strip searches.

Also in December, Indiana rapper Freddie Gibbs got away with smuggling some pot on a flight, but not without a handwritten TSA message: 'C'mon son'.

In August 2011, the agency was accused of racism after targeting the hair of two black women at airports in Seattle and San Antonio.

In May 2011, a photo made the rounds on the internet that showed - of all people - an infant being frisked by a thorough TSA agent.