Murder on the Fairway

A body has been found at the Green Estates Fairway. Next to the body was a bloody golf club which was later confirmed by the medical examiner to be the murder weapon. Thankfully, only ten men besides the victim had been golfing that day. The police interviewed each man and asked:

1. How did you know the victim?
2. Did you have any reason to harm the victim?
3. What reasons might someone else have harmed the victim?
4. What was your final score after 18 holes that day?

After the interview the policeman asked each suspect to fill out a form containing their name, address, telephone number, and time and date of the preliminary interview conducted, so the police could follow up if necessary. After interviewing all ten men, the police made an arrest and the man confessed to the crime. How did the police know the culprit?

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