Jack Berghouse told the Palo Alto Daily News (http://bit.ly/ZgmXgJ) that he dropped the suit against Redwood City-based Sequoia Union High School District mainly because of the difficulty of proving that the penalty had hurt his son's chances of getting into a good college.
Berghouse sought the lawsuit's dismissal last month, nine months after he filed it.
His son was thrown out of the sophomore English honors class after he was caught several weeks earlier copying another student's homework.
Berghouse did not dispute that his son had cheated, but said the punishment was disproportionate to the offense.
The district says it has spent more than $15,000 defending the suit.
Information from: Palo Alto Daily News, http://www.paloaltodailynews.com