- Illegal bookmaker Mathew Bowyer’s gambling activities exposed anti-money laundering failures across three major Las Vegas casinos, resulting in nearly $27 million in combined regulatory fines.
- Caesars and other casinos ignored years of red flags about Bowyer’s unverifiable income and continued allowing him to gamble until the media reported his home was raided by federal agents.
LAS VEGAS — The criminal activities of convicted illegal bookmaker Mathew Bowyer have exposed widespread anti-money laundering deficiencies across Nevada’s casino industry, resulting in millions of dollars in regulatory fines against major Strip operators.
Bowyer, 50, is currently serving a 12-month federal prison sentence for operating an illegal gambling business, money laundering, and filing false tax returns. He gained national notoriety for accepting more than $325 million in bets from Ippei Mizuhara, former interpreter for baseball star Shohei Ohtani, who stole nearly $17 million from the athlete to fuel his gambling habit.
Pattern of Regulatory Failures
Three significant Las Vegas operators have been fined heavily by the Nevada Gaming Control Board for permitting Bowyer to wager despite suspicions regarding his source of funding.
In November 2025, Caesars Entertainment reached a $7.8 million settlement, joining MGM Resorts and Resorts World Las Vegas in the fines associated with the bookmaker.
| Casino Operator | Fine Amount |
|---|---|
| Resorts World Las Vegas | $10.5 million |
| MGM Resorts | $8.5 million |
| Caesars Entertainment | $7.8 million |
Internal casino documents reveal a troubling pattern. Bowyer was flagged as “high risk” as early as 2017, yet continued gambling freely at multiple properties until January 2024.
Caesars Palace had documented that two other casinos banned Bowyer in 2017, yet allowed him to deposit more than $4 million that same year through front-money accounts.
Years of Warning Signs Ignored
Multiple due diligence checks revealed Bowyer lacked verifiable income to support his play, with casinos unable to determine his source of funds or employment.
Despite the expansion of legal sports betting across the country, illegal bookmaking operations like Bowyer’s persist, exploiting gaps in casino compliance programs.
The situation grew more egregious over time. An anonymous caller identified Bowyer as a bookie in June 2019. The casino suspended his account twice, only to reinstate it after Bowyer provided tax returns and casino win statements. Even after receiving a 314b request — a financial form affiliated with the U.S. Patriot Act — in 2021, Caesars continued allowing his play.
It wasn’t until media stories of federal agents raiding Bowyer’s Orange County house in October 2023 that Caesars blacklisted him. Over the course of over two years, Bowyer allegedly lost over $7 million betting in Las Vegas casinos with the money he made from his illegal business.
The violations have drawn scrutiny to the state’s regulatory framework, once considered the gold standard. While legal Nevada sports betting operates under strict oversight, these cases reveal how traditional casinos failed to prevent money laundering through their high-roller programs.
