Queensland's corruption watchdog has dropped investigations into Clive Palmer and Deputy Premier Jeff Seeney.
Mr Seeney referred the mining magnate to the Crime and Corruption Commission (CCC) in June for allegedly trying to buy political support.
He alleged that Mr Palmer sought special treatment for his western Queensland mining investments shortly after the Liberal National Party's landslide victory in 2012.
But the CCC announced on Friday that it had ended the investigation because the prospects of proving corrupt conduct were too limited.
Acting CCC chairman Dr Ken Levy wrote a letter to Mr Seeney saying there were no grounds to suspect Mr Palmer would have had any success in gaining preferential treatment.
"There is no evidence that the conduct alleged did in fact result in any corruption within the state government," he told Mr Seeney in Friday's letter.
"The commission does not consider the information available provides sufficient grounds to indicate that an investigation would likely be productive.
"For these reasons, the commission does not intend to take any further action."
But Mr Palmer said the CCC had dropped the investigation because Mr Seeney's allegations were not true.
"It's not surprising. It was a false complaint. There was no truth to what he said, and the evidence is clear that there was no truth in what he said," he told AAP.
The federal MP also claimed it was Mr Seeney who tried to use the CCC as a political weapon.
"I would think so because as I said he held a press conference to announce it," Mr Palmer said.
"If it was any matter that was serious in any way, you wouldn't want to prejudice the matter by having a press conference. You'd want to make a proper complaint and have it dealt with in the proper manner."
The CCC also decided to drop an investigation into Mr Seeney for not referring the allegations to the then Crime and Misconduct Commission back in 2012.
The watchdog said only "public officials" were required by law to report suspicion of misconduct and members of parliament, such as Mr Seeney, were not seen as public officials.
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