This factor is included in the Controlled Substances Act
to allow the control of chemicals (like lysergic acid) and
substances (like poppy straw) that are involved in the manufacture
of controlled substances. The relationship of marijuana and
its constituent parts is analogous to that of precursor chemicals.
This is a good context for a discussion of the relationship
of marijuana to its constituent parts.
The DEA maintains that studies involving THC or other
cannabinoids are not a valid basis for scientific assertions
about marijuana. The topic has been discussed above in section
2 on the pharmacology of marijuana. This section addresses
this issue within the context of the practices and traditions
of the scientific community, particularly in a historical