"mercy rules" ??

[SWFLguy]

I'm curious--- here in Florida the FHSAA has a mercy rule
that allows a running clock after the first half if the team
on the losing end of a 30 point differential requests it.
The clock will run continuosly except for team or official time outs or if the score drops back below the 30 points.
Any other states have such a rule ? I think it is a good idea;
and would like to see it accepted by the National Federation.