Mercy rule applications in last 2 mins.

[CJRef]

Per the MHSAA Officials Guidebook:

I. Point Differential Rule
A. At all levels of play and in MHSAA tournaments, after the
first half when one team has a lead of 40 points or more, a
running clock shall be established. The clock shall revert to
regular time schemes should the score be reduced to a 30-
point lead or less. During any running clock mode, the clock
shall be stopped as normal for all timeouts and between
quarters; and for free throws during the last two (2) minutes
of the game. By league or conference adoption the point
differentials (both to establish a running clock and then
resume normal timing) may be modified at the junior high
middle school level only.

They used to mail the guidebook annually, but I believe they've tried to convert a lot of their material to their web-site only. If you haven't read it recently you can find it at: http://www.mhsaa.com/resources/official.htm.

It contains information on MHSAA adoptions of NFHS rules for all sports in addition to game suspension, ejection protocol and other game management guidelines, as well as all other policies pertinent to officials.