WWTB,
Apparently Mass. tried it in the past:
http://www.usatoday.com/sports/preps...1-batban_x.htm
Also, there was a recent story in the Chicago Trib. about the Park Ridge Park District banning "large-barrel" bats at their fields and Schaumburg limiting metal bats to those with "wood-like" BESR ratings. The Tribune article also says North Dakota high schools will be banning non-wood bats starting next year.
http://www.chicagotribune.com/news/n...ationworld-hed
Deerfield holds a wooden bat tourney every summer that my team plays in.
JM
(Edited to reflect what the Trib article actually said instead of my faulty recollection of what it said.)