The Twilight Zone - Dust torrent

Luis Gallegos is scheduled to be hanged in a dusty western town after he was found guilty of killing a child while drunk. Gallegos' father begs everyone for mercy but the Marshal, who doesn't think the prisoner is a bad sort, has little choice but to proceed with the sentence. Peter Gomez decides to take advantage of the situation by selling the father his 'magic dust' that will make the townsfolk take pity on his son. Events provide for an unexpected conclusion