A new permanent rule for visitors to Indiana state park system regarding firewood takes place on Saturday. Under the new law, visitors to state parks, forests, fish & wildlife areas and reservoirs may not bring firewood from out of state. For in-state visitors: firewood may be brought in, however, the bark must be removed. The insect larvae live in the sapwood under the bark. Removing the bark cuts down on the chance of spreading the emerald ash borer.