Claim: Heroin is a common illicit opioid.
Evidence: Heroin , also known as diamorphine among other names , is an opiate most commonly used as a recreational drug for its euphoric effects.
Opioid , a more modern term , is used to designate all substances , both natural and synthetic , that bind to opioid receptors -LRB- including antagonists -RRB-.
It is generally illegal to make , possess , or sell heroin without a license.