What Happens During an MLB Gambling Investigation? Explaining the Process

By Oliver Wiener July 04, 2025 10:06

Major League Baseball (MLB) has long maintained a strict zero-tolerance policy toward gambling-related misconduct to protect the integrity of the sport. When allegations of gambling arise, the league initiates a thorough and confidential investigation process designed to uncover facts, ensure fairness, and uphold the game’s reputation. Recent cases, such as the ongoing inquiry into Cleveland Guardians pitcher Luis Ortiz and the 2024 scandal involving Los Angeles Dodgers interpreter Ippei Mizuhara, highlight how MLB handles these sensitive matters.

Initiation of the Investigation

An MLB gambling investigation typically begins when suspicious activity is detected or reported. This can come from various sources: internal monitoring systems, tip-offs from sportsbooks or betting integrity firms, media reports, or law enforcement agencies. For example, Ortiz’s investigation was triggered after a betting-integrity firm flagged unusual wagering patterns on specific in-game pitches during his starts, prompting MLB’s Department of Investigations to open a formal inquiry.

Once MLB becomes aware of potential gambling violations, the league’s Department of Investigations established in 2008 following the Mitchell Report on performance-enhancing drugs takes the lead. This unit has handled high-profile cases involving players like Alex Rodriguez and Trevor Bauer, and now focuses on gambling-related probes with equal rigor.

Gathering Evidence and Interviews

The investigative team collects extensive evidence, including betting records, communications, financial transactions, and game footage. They also conduct interviews with the player(s) involved, teammates, team personnel, and others who might have relevant information. The process is confidential to protect the integrity of the investigation and the privacy of those involved.

In the case of Mizuhara, reports revealed his connections to an illegal bookmaker and allegations of theft from Shohei Ohtani to cover gambling debts. Mizuhara eventually pleaded guilty to federal charges and was sentenced to prison, illustrating the severity with which MLB and legal authorities treat these violations.

Administrative Leave and Interim Measures

During the investigation, MLB may place the player on paid administrative leave, a non-punitive measure that removes the individual from team activities while the inquiry proceeds. Luis Ortiz was placed on such leave through the All-Star break, preventing him from participating in games or team facilities but allowing him to maintain salary and benefits.

This step ensures the investigation is not compromised and signals MLB’s commitment to a thorough review before any disciplinary action.

Resolution and Discipline

After completing the investigation, MLB evaluates the evidence and determines appropriate disciplinary measures. Penalties for gambling violations are severe and can include suspensions, fines, or lifetime bans. The league’s Joint Drug Prevention and Treatment Program explicitly prohibits betting on baseball at any level, with violations punishable by at least a one-year ban.

The 2024 lifetime ban of former San Diego Padres infielder Tucupita Marcano, who wagered on MLB games including those involving his own team, underscores the league’s harsh stance. Other players have received one-year suspensions for betting on baseball games they were not personally involved in, and even MLB umpires have faced dismissal for gambling-related misconduct.

Maintaining Integrity and Transparency

MLB’s commissioner and leadership emphasize that protecting the sport’s integrity is paramount. Commissioner Rob Manfred has stated, “We have learned from history that the slightest doubt about fairness can erode fan trust.” The league balances transparency with confidentiality, often releasing statements confirming investigations while withholding details until conclusions are reached.

An MLB gambling investigation is a meticulous process involving evidence gathering, interviews, and interim measures designed to ensure fairness and preserve the game’s integrity. The league’s history of strict enforcement and recent high-profile cases demonstrate its unwavering commitment to rooting out gambling-related misconduct. As legal sports betting expands nationwide, MLB’s vigilance remains critical to maintaining fan trust and the sanctity of baseball.