Most prescription drugs (including fentanyl and morphine) can be lawfully possessed by a person if they have had it prescribed by a physician. Otherwise, the penalty for importing/ possessing drugs such as fentanyl can be significant.
In the United States, heroin is a Schedule I Controlled substance. The penalties for importing <100gms are up to 20 years imprisonment and a fine up to one million dollars. Penalties for the importation of >100gms range up to life imprisonment and fines of up to ten million dollars. Fentanyl and morphine in the US are Schedule II Controlled Substances and share the same penalties as Schedule I drugs listed above for lesser amounts. Larger amounts can mean life imprisonment
In Australia, the importation/ possession of <0.005gm of fentanyl and <2 grams of morphine can result in up to 10 years imprisonment and a $360,000 fine. The higher the amount of the drug possessed, the higher the penalties. Similar penalties apply to heroin that, in Australia, is a ‘border controlled drug’.