Only in the absolute sense. You cannot provide canonically that an unobserved event happened or didn't happen.

That's why we have an investigative process. The investigator or auditor looks at patterns and notices that a guy wins the lottery multiple times. Then you dig and notice that the guy buys or claims tickets at a single or small collection of retailers. Then you dig and find out that there are personal relationships between the "winner" and the people in the store.

At that point, there are options:

- The lottery can amend it's regulations and review how the games work and make appropriate changes.

- The lottery can investigate the retailer and take action against the retailer's license to sell tickets. Typically the lottery has broad discretion to take action there with a legal standard that has a low bar.

- The lottery can pursue a civil action against the retailer or "winner". Civil actions require a jury to meet a preponderance of evidence standard.

- The police or IG can pursue a criminal case, with a high standard.