How to Say "dealing" in Spanish
The Spanish word for “dealing” is “tráfico” — B2 level.
English → SpanishB2
nounB2formal
illicit exchange of goods

Examples
Las autoridades luchan contra el tráfico de drogas en la frontera.
The authorities are fighting drug trafficking on the border.
El tráfico de especies protegidas es un delito grave.
The trafficking of protected species is a serious crime.
Specifying the Goods
When talking about illegal trade, you must connect 'tráfico' to the item being traded using the preposition 'de' (of): 'tráfico de armas' (arms trafficking).
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