Congress, the body that writes and passes US federal laws, will not vote a bill into law that moves psilocybin or MDMA out of Schedule I — the strictest legal category, reserved for substances the government considers highly dangerous and medically useless. Right now, both substances sit in that category alongside heroin. Changing that through Congress requires enough votes and enough scientific proof, and neither exists yet.
The votes and FDA evidentiary basis are absent; Congress favors lower-risk research bills over scheduling changes. Distinct from the DEA-administrative prediction because it tracks statutory enactment specifically.