Accused drug cheat Shayna Jack can return to the pool next year after anti-doping body agrees she accidentally took a banned substance

Accused drug cheat Shayna Jack's swimming career has been saved as a court rules she did not knowingly take banned black market muscle-builder Ligandrol.

The 22-year-old was sent home ahead of the FINA World Championships in South Korea in 209 after she returned a positive drug sample from a competition in Cairns in 2019.

Despite maintaining she would never take performance-enhancing drugs, the Australian Sports Anti-doping Authority handed the maximum suspension of four years - which would have ended her swimming career.   

In June, Jack fell victim to a sickening extortion attempt while appealing against her four-year suspension. 

Jack reported several disturbing messages she received over the weekend to Queensland Police and the Court of Arbitration of Sport, The Daily Telegraph previously reported. 

A hacker attempted to blackmail banned Australian swimmer Shayna Jack , 21, over the weekend and threatened to post pictures and messages from her Facebook account 

Pictured: When Jack ignored the hacker's threats and requests for money, a post appeared on her Facebook account that said she 'used doping in the 2017 Olympics'

The hacker messaged the Commonwealth Games gold medalist's Facebook account and threatened to post pictures of her.

'If you don't pay – you will regret this,' the hacker said.

They also referenced the positive Ligandrol reading that Jack returned ahead of the 2019 World Swimming Championships in South Korea.  

Jack contacted Queensland Police on Monday and hired an IT specialist to secure her personal details. 

She then received more threats demanding money around 9.40pm on Monday night.    

'I can see what you're doing at all times,' the hacker wrote. 

Jack chose to ignore the threat and received a warning that something 'disturbing' would be posted if she failed to respond.   

The swimmer woke on Tuesday morning to find a message from the hacker posted to her Facebook account.  

The hacker sent Jack a number of disturbing messages that said 'I can see what you're doing at all times' and 'if you don't pay – you will regret this'

'I regret that I used doping at the 2017 Olympics,' the post read - despite the fact no Olympic Games were held that year. 

The blackmail attempt could have major ramifications for Jack's appeal.  

Her lawyer, Tim Fuller, said the extortion attempt was 'disgusting' and had 'shaken' the 21-year-old.      

The Court of Arbitration for Sport confirmed earlier this month that a date had been set for Jack's hearing but would be kept private.  

Jack will appeal the four-year ban recommended by the Australian Sports Anti-Doping Authority in March.   

She has regularly protested her innocence and denied knowingly taking the drug. 

'It's something that is so far-fetched from what I'd ever think would happen to me,' Jack told The Sunday Project last year.  

Jack is set to appeal against a four-year swimming suspension after she tested positive for banned muscle-builder Ligandrol last July