Several FIFO workers have claimed they tested positive for drugs during workplace screenings after consuming a popular post-gym energy drink.

The claims relate to EHPlabs OxyShred, a caffeine-based drink marketed as a 'thermogenic fat burner' designed to increase metabolic rate, boost energy and aid fat loss.

Some Australians claimed it caused them issues during routine tests at work, according to the social media page Aussie Corporate.

'There have been reports and concerns from FIFO workers on site that after drinking EHPlabs OxyShred energy drinks, they returned positive methamphetamine results on workplace drug screening tests,' Aussie Corporate said.

The Daily Mail has contacted EHPlabs for comment.

The global manufacturer's products have been approved by authorities including the US Food and Drug Administration and the World Anti-Doping Agency, but the company does not guarantee outcomes for workplace drug testing.

Social media users were divided by the claims, with some suggesting the drink was being used as an excuse for failed drug tests.

'As a FIFO wife, from what I hear on site, sounds like someone is trying to get out of a failed drug test,' one said.

But a woman said she had a similar experience: 'It's actually a real situation as I am one that tested positive to an oral swab from the EHP Labs product and it's only disproven by an actual blood test.'

The claims come just months after a young dental nurse in Sydney said the energy drink made her also test positive during a police roadside drug test. 

The woman broke down in tears inside a police testing van after claiming she was arrested following the test, according to a TikTok video she posted. 

She was driving home from a gym workout while drinking a $4.90 can of Kiwi Strawberry OxyShred when she was pulled over for the random test the day after Anzac Day.

The woman said officers first carried out a breath test with her before then conducting the roadside drug test.

But as she waited for the result, she said she was stunned by what happened next. 

'He comes over to the car, and he goes, "You're under arrest, you've tested positive to meth",' she said. 

'I've never done meth in my life, never have, never will. I thought he was having a laugh with me, so I said, "sorry, what"?'

The gym-goer burst into tears as officers led her into the testing van for further swabs, which were later sent to a laboratory for analysis. 

The woman claimed she repeatedly told officers there was no way she could have taken methamphetamine.

Traffic law legal expert Karen Stanley said the roadside saliva test, otherwise known as a 'lick test', is only an initial screening tool.

But if motorists return a positive result, it gives police the power to carry out further testing.

This often involves a second saliva sample taken inside a mobile testing unit, which is then sent to a laboratory for detailed analysis.

'Those lick tests are known to be wildly inaccurate,' Ms Stanley told the Daily Mail.

'I'm hearing about it all the time. You don't have to go with police for the second test, but there would be charges if you refuse.'

In most Australian states, drivers are not formally charged until the lab results confirm the presence of an illicit substance.

Ms Stanley said false positives can occur when legal substances such as medication or ingredients trigger a reaction similar to an illicit drug.

'Lots of things can give you a false positive,' she said.

'I don't know if that drink did it, but the tests are not that accurate and do regularly give that result. People can get an immediate disqualification from that.

'Results from the second test can take days or weeks to come back, and while their licence should be reinstated when that happens, sometimes it is not.

'Then people have no choice but to go and see a lawyer and pay $3,000 to go to court to sort it out.

'I'm often hearing about how this is a problem and I have read studies on it too.'