street drug

/S T R IY1 T D R AH1 G/
noun
  1. 1

    A drug used illegally and recreationally for its euphoric and other mind-altering effects such as: opiates, cannabinoids, benzodiazepines, amphetamines and others.

    Street drug sales are a huge problem for law enforcement since they are a magnet for gun violence and drug users.

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Source: https://en.wiktionary.org/wiki/street%20drug