A third man has been convicted of selling pot in a case that began when his brother asked strangers at a bar whether any of them wanted to buy some marijuana. Turns out the bar patrons were Lincoln police officers at a party.

The Lincoln Journal Star reports that 57-year-old Richard Carr was convicted Tuesday of delivering a controlled substance.

Prosecutors say Carr’s younger brother, John Carr, had made the pot offer on Jan. 9, 2011. No immediate sale resulted, but two undercover officers followed up two days later at John Carr’s apartment. Prosecutors say Richard Carr was there and participated in the transaction.

John Carr got probation after pleading no contest. Another man involved, Jay Rickman, also got probation.

Richard Carr is scheduled to be sentenced in February.