Prosecutors say they have unearthed forensic evidence that shows how a former computer security official for a US state lottery association let him rig drawings worth millions of dollars across five states using unauthorized code that tampered with a random number generator used to pick winning tickets.

Eddie Raymond Tipton was charged last April and eventually convicted. Prosecutors said the man used his position as information security director of the Multi-State Lottery Association to access a room that housed the random number generator. But until recently, they weren’t able to prove exactly how Tipton went about modifying the code so it produced predictable outputs that could be used to pick winning tickets.

According to an article published by the Associated Press, here’s how it worked:

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Neutered random number generator let man rig million dollar lotteries