In most states, the agreement of a person who has been adjudicated insane is not considered legally valid. This legal principle is based on the fact that a person with mental illness or impairment may not have the necessary capacity to understand the consequences of their actions or decisions.

The concept of mental capacity is an essential element of most legal systems, and it refers to a person`s ability to make informed decisions and to understand the implications of those decisions. In the case of individuals with mental illness, mental capacity can be impaired, and this can have significant implications for their legal status.

When a person is found to be legally insane, they are typically deemed to lack the necessary mental capacity to make decisions on their own behalf. In most states, this means that any agreements they enter into may not be legally enforceable. This is because, in many cases, they may not fully understand the consequences of their actions or may not be able to give proper consent.

In some cases, a person with a mental illness may have a legal guardian or conservator who can make decisions on their behalf. In these situations, any agreements made by the guardian or conservator would generally be considered legally valid, as they would be acting on behalf of the person who lacks mental capacity.

It is also worth noting that the specifics of mental capacity laws can vary from state to state. Some states may have different criteria for determining capacity, or they may have different rules regarding the validity of agreements entered into by individuals with mental illness.

Overall, the legal status of individuals with mental illness can be complex and challenging to navigate. However, by understanding the basic principles of mental capacity and legal insanity, it is possible to make informed decisions and to protect the rights of those who may be vulnerable due to their mental health status.