Which factor might disqualify someone from entering a legal contract?

The factor that might disqualify someone from entering a legal contract is the lack of mental capacity due to substance abuse. In contract law, an individual must have the mental capacity to understand the nature and consequences of their actions when entering into a contract. If a person is impaired by substance abuse, this can significantly affect their cognitive functions, including their ability to comprehend the terms of the contract and make informed decisions.

This principle is based on the idea that contracts are founded on mutual agreement and understanding. When someone is under the influence of drugs or alcohol, they may not fully grasp what they are agreeing to, which can invalidate their consent. Courts generally recognize this vulnerability and may declare contracts voidable if one party lacked the mental capacity to enter into the agreement due to substance abuse at the time of signing.

Conversely, being an emancipated minor, being sober and of legal age, or understanding the terms of a contract typically validates the individual's capacity to enter into a contract, provided all other legal requirements are met. These circumstances suggest that the individual is capable of giving informed consent.