Prediction markets platform Kalshi says political staffers are still trying to place bets on races in which they are involved despite the company’s internal efforts to ban the practice, reports NPR.

Robert DeNault, Kalshi's head of enforcement and legal counsel, told the news outlet that his team has blocked many campaign trades using Federal Election Commission data.

"If we're able to identify a potential match, we have markets that are associated with each of the campaigns that are flagged, and those individuals would be prevented from placing trades on those markets," he said.

One campaign operative told NPR they were still able to trade on a race they were involved in.

Kalshi in April suspended three U.S. congressional candidates for “political insider trading,” including Democratic Minnesota state Senator Matt Klein, who was seeking the nomination to run for the U.S. House of Representatives seat representing his state’s 2nd district; Republican Ezekiel Enriquez, who lost his party’s nomination for the U.S. House seat representing the 21st district in Texas; and Mark Moran, an independent running for U.S. Senate in Virginia.

Moran admitted to having bet $100 on himself, saying he wanted to get caught.

“I traded $100 on myself, knowing this would happen (also knowing that I wouldn’t be vying for the Democratic nomination) and the attention it would create to highlight how this company is destroying young men and as Senator I will go after Kalshi and impose significant penalties on them – 25% – a vice tax – to pay down our national debt,” Moran wrote on X.

Prediction markets have surged in popularity since the ​2024 U.S. presidential ​election, when participants bet heavily on Donald Trump’s victory.

However, there is a growing concern about insider trading on them after an ⁠unknown trader made more than $400,000 betting that ​Venezuelan President Nicolas Maduro would be ousted ​from his position ahead of a U.S. mission to capture the leader.

Kalshi’s DeNault told NPR it was working to expand campaign monitoring to local elections.

"You have to be ready to also follow up with investigations where you've detected people who've gotten around systems," DeNault said.

Reuters contributed to this report.