Official Rules(view all)

NFHS 8-4-1h, 8-4-2g

NFHS 8-4-1h, 8-4-2g/OBR 6.01a6, 10

If a runner interferes on a double play ball, even if the interference is unintentional, the runner is out and so is the other runner or batter-runner who the umpire judges would have been the second out.

[OBR: if the interference is obviously unintentional, only the interfering runner is out. Other runners returned to their time-of-pitch bases and batter-runner placed at first.]