REVEALED: Explosive text messages from jockey Jamie Kah as hearing into 'white powder' scandal commences at Victorian Racing Tribunal

Superstar Aussie jockey Jamie Kah has given her version of events on the first day of her explosive 'white powder' hearing before the Victorian Racing Tribunal.

On Monday, Kah outed stablehand Ruby McIntyre as the person who filmed the controversial video which was leaked to the media.

The jockey, who just rode six winners during the Melbourne Cup Carnival, claimed she didn't know McIntyre was recording her cutting lines of a mysterious white powder with an ID card.

'People say I should've known, but I didn't know she was taking that video,' Kah told the hearing.

'I got the screenshot of the video the night before it went public to the press.'

 When asked what she would have done if she had known a video was being recorded, Kah replied: 'In a polite way I would've kicked her out and been very upset that video was taken, made sure it was deleted or gone and not sent to anyone.

'… I told stewards that, the next day after the incident she said thanks for having me and I said no worries, that was the only text. (That was) four days before I knew.'

Kah said McIntyre - who she had only met six hours earlier - never sent her the video footage, nor did she indicate that she would share it with others.

The jockey said the photo selfie on the night was taken by her but 'I was not sure where that photo was going to go.'

The hearing was told that Kah text messaged the stablehand in the ½-day window before the explosive images were published in the media.

'What the f**k are those photos doing going around,' Kah wrote. 'Who has them?'

When questioned why she texted McIntyre, Kah answered: 'I wanted to know who she sent the videos or photo to.'

'I still to this day don't know how they got to the media. She (manager Emma Shelley) doesn't how they got there I don't think. I think she has her assumptions.

 'I don't know who was the in between person who sent them to the media. Obviously someone she sent the video to, and it's gone from someone.'

Kah had also sent a text message to her friend Jacob Biddell, saying, 'Told her [McIntyre] not to post anything. Such a f***ing bitch.'

McIntyre admitted during the hearing that she 'quickly recorded' the video and 'sent it to just one other friend.'

'Yeah I probably did (conceal the taking of video),' she said.

When questioned about how she recorded the video, McIntyre replied: 'I was just across the table standing up just on my phone close to my body, it wasn't something very obvious, not in anyone's faces.

'I don't think Jamie or anyone for that fact would be happy for a video going any further than that. No (didn't tell Kah / Jacob Biddell she took the footage). No (I didn't send to them).'

The stablehand allegedly captioned an image shared with: 'Something to add to the list of things I never thought I'd be doing, doing coke with Jamie Kah and another friend at her house until 3am and staying the night.'

McIntyre explained that the caption was not written by her.

'I'm not sure where the actual messages and photo and screenshot, in this format (evidence book before tribunal), has come from,' McIntyre said.

Pressed on the caption, McIntyre explained: 'Not to my recollection, I didn't write any of these things … I'm not sure who it's come from … everything in that screenshot has not come from my phone, has not come from me.'

Kah's barrister Matthew Stirling objected to the focus of text messages that stewards alleged proved Kah lied about her knowledge of the gathering when she was interviewed by stewards.

Kah's manager Emma Shelley text messaged McIntyre to 'delete every single photo and that Instagram. Deny, deny, deny.'

Kah told stewards she would volunteer a drug test 'because that's (drug use) not something I'd do or would be doing when I'm trying to get back to race riding'.

A drug test undertaken returned a negative result 'to any and all number of substances'.

Kah confirmed she has never tested positive to any drugs.

The case has been adjourned until November 27.