Final answer:
The transaction may be invalidated as a 'contract' due to the illegal nature of drug sales and the absence of certain elements necessary for a legally binding agreement.
Step-by-step explanation:
The transaction between the dealers, involving the purchase of drugs, may be invalidated as a 'contract' due to the presence of certain factors. In order for a contract to be legally binding, certain elements must be present, including legal capacity, offer and acceptance, consideration, and a genuine intention to create legal relations.
However, the illegal nature of drug sales can render the transaction void or unenforceable. Engaging in the purchase and sale of illegal substances goes against public policy and is generally prohibited by law. Therefore, the presence of drugs as the subject matter may nullify the transaction as a contract.
Additionally, the illegal nature of the transaction may also make it difficult to enforce in a court of law, as courts typically do not provide remedies for illegal transactions.