http://agathe.gr/democracy/the_verdict.html
The Verdict After the speeches and other evidence had been presented, the members of the jury voted by casting ballots. A series of vase paintings of the early 5th century B.C. show a mythological story, ... The majority are datable to the 4th century B.C., but the latest, and especially those of lead, may run into the 2nd century B.C. If the vote was for guilty, then there was a second phase of the trial to set the penalty.