Injury on a home run

[greymule]

Is the runner required to touch (under their own power) all the bases or is it sufficient for the preceding runners to drag a lifeless body over the bases.

Dragging the body across the bases would be sufficient.

However, there's quite a dispute raging in the YSISF over whether the run counts if the preceding runner rolls just the BR's head across the bases. There's a game under protest where the umpires ruled that such a run counted, and the teams are awaiting an official ruling.