The U.S. Supreme Court this month heard arguments in a case involving a Brazil-based church that uses a hallucinogenic tea during its worship. The Bush administration says the tea is illegal and dangerous, but members of the church in New Mexico consider it sacred. How should American society balance religious freedoms with other laws as well as with personal safety and health?
This is a very difficult call. There are very few churches in the U.S. that use mind altering substances, but that does not mean they shouldn't have the right.
The only approach I can think of is to have a special team of spiritually trained ethicists review the group's organization to insure that this is not just an excuse to use drugs, or that the drugs used are then abused. I don't think it would be right to just have some sort of outright ban.