I think you are kind of asking a Question that I have lots of details for.
This was written by me, Aug 2018, see attachment to see the PDF it is referring to
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A lot of people seem to think they know how Religious Marijuana Works in Court and are willing to spout off about it, but they do not know what they are talking about, so I want to explain how it works for everyone.
First, most Religious Marijuana Case's failures can be summed up by this 1 DEA Response to the Church of Reality:
http://www.churchofreality.org/dea/dea-respondents-brief.pdf
Here is what they told them
1. They aren't a Religion, because they have no Gods, no Spirit World, no Diet, no Clothing or Jewelry, no Mandatory behavior, no Banishment for violation of behaviors, no Fasting, etc, etc; the case that contains the rules for what "is or is not a Religion" is here: Africa v. Commonwealth, 662 F.2d 1025 (3d Cir. 1981)..
2. They asked for a Medical Exemption, even though they said it was Religious use, they said they were like self-medicating, and if you want some kind of Medical Exemption from a Scheduled Substance, you need a PhD/MD.
3. They said "all plants", so the DEA said "why don't you use all the others then instead".
4. They said it was for Meditation, which means that it is not Central to the Religion, and they are not burdening them by denying it. That has been the rule back since Timothy Leary said he used it for Meditation, and they said that it has to be central to the Religion like the Native Peyote Religion, where without it, there is not a Religion.
That sums up what they said in the Church of Reality response, and also sums up why most Religious Marijuana Cases fail, for example, The International Church of Cannabis has been ruled a "Club" and not a Religion, because no one in the "Religion" actually has to smoke Marijuana, it's not mandatory. The Ethiopian Zion Coptic Church is the best Case to look at. They are a Rastafarian Church that almost got an exemption in the 80s, but the DEA argued that someone could forge a Membership card and the Marijuana could get into illegal Channels and the Court used that reasoning to accept the "If no one can do it, Religion can't do it" argument. But in 2016 the Federal Marijuana Registry Opened up, and the Company Catalent and 25 other Companies this year, are now importing Marijuana for Research, and GreenWhich Pharma is creating a THCv Medicine.
In 2006, Ayahuasca became legal for not only Religious use, but for Importation for Religious use, through Customs. So DMT, a Schedule I Substance, is allowed to be shipped in through Customs for Religious Use. Then the DEA was forced by the Supreme Court to create an Exemption process, so there is an exemption process now. And I am going through the process. Have you heard of Lexi, the little girl who has Seizures and is from Texas? She went to a Federal Court with a Medical Argument, and she almost made it in the case "Washington v. Sessions, et al", except that she "didn't follow the DEAs guidelines" so the Court would not determine the Constitutionality of her argument until she went through their process. I have gone through their Religious Process, and am almost finished with that process, so I have the standing that Lexi lacked in challenging the Controlled Substances Act, the entire Law, plus I have standing for Religious use in Court.
Our Temple believes that Marijuana is the Flesh of the Lord God Shiva, the Hindu Marijuana God. And THCv is a form of Lord Shiva, and is used for fasting. The Federal Court has ruled that the DEA only has the right to ban "Marijuana" as it is defined in the Law, and do not have rights to regulate anything beyond that, see Hemp Industries Association v. DEA, Nos. 03-71366, 03-71693 (2004) where they determined THC naturally found in Marijuana seeds is not THC under the law because it is not "Marijuana" or "Synthetic THC". So the least restrictive means, would be to not ban us from using these Legal, Unregulated, Substances. We also have Gods, we do Divination and Prophecy, we have a Spirit World, and Jewelry, and Hair styles, and everything that are involved in Observing the Religion, so it is a Religion. So, now that we have a Religion, and non-Scheduled Substances involved (I have given the DEA the option to let us grow plants in legal States, or to let us Synthesize the Cannabinoid), this is a Case just like the Scientology E-Meter Case. And Scientology E-Meters are unregulated by the Government as far as their Religious Use, see United States v. ARTICLE OR DEVICE, ETC., 333 F. Supp. 357 (D.D.C. 1971).
So that is how Religion works in the Courts, and there will be Case Law for it soon so you can just copy me.