Fentanyl is Schedule II, though.

Ulterior motives aside, how about if you wanted to run that same study with LSD?

Would a Schedule I drug have been as accessible as a Schedule II drug?

Ah, I didn't know, it seemed dangerous enough by the amount of logging and tracking we had to do.

Fentanyl is incredibly dangerous (it's what killed Prince). Here's a depressing vice episode about its use in Canada: https://www.youtube.com/watch?v=28rJqj-7pEY

Then why is it near impossible to study Marijuana?

It is classified as Schedule I, not Schedule II.

The drug or other substance has a high potential for abuse.

The drug or other substance has no currently accepted medical treatment use in the U.S.

There is a lack of accepted safety for use of the drug or substance under medical supervision.

Schedule I drugs:

    Heroin (diacetylmorphine)

    LSD (Lysergic acid diethylamide)

    Marijuana (cannabis, THC)
    Mescaline (Peyote)

    MDMA (3,4-methylenedioxymethamphetamine or “ecstasy”)

    GHB (gamma-hydroxybutyric acid)

    Ecstasy (MDMA or 3,4-Methylenedioxymethamphetamine)

    Psilocybin

    Methaqualone (Quaalude)

    Khat (Cathinone)

    Bath Salts (3,4-methylenedioxypyrovalerone or MDPV)

Done forget beta-carbolines and a handful of tryptamines that are always present in the human body, and also Schedule I.

Because Marijuana is very dangerous. Sometimes even one snort can land you in jail for life... I don't think anyone in a right mind would like to risk it.

Poe's law?

Here's the part that made his point clear: "in jail for life" - it's the law that causes the danger.