Any witness may testify in a criminal trial, the competency would be determined by the cross examination. You would have to further define what you mean by "competent?"
Added: If the witness has previously been declared mentally incompetent by the court or by psychiatric exam, it is doubtful that the opposing attorney would even allow the individual to give testimony without challenging their status to the court.
Generally speaking anyone can be asked to testify. Though someone can be ruled as medically or mentally unable or incompetent to testify.
Yes AA Not in the United States
If they are mentally competent, yes. Their disability does not disqualify them.
Yes
Yes. As long as a person is mentally and physically competent, and holds a current drivers' licence, he/she can drive in Australia.
yes
Depends. There are Very different degrees of PTSD. If a person has been adjudicated as mentally incompetent, they cannot. Most vets with PTSD are very mentally competent.
A person has capacity to contract if he has reached the age of majority ( in California, age 18 ) and is mentally competent. It is not necessary to be declared competent by a court, however.
If the husband has become mentally incompetent as a result of the stroke, he would not be considered mentally competent to grant a power of attorney to anyone. A power of attorney that is granted during the time of one's incompetency would generally not be considered valid. If a person is mentally incompetent, an interested person could generally petition a probate court (in the county in which the mentally incompetent person resides) to have a guardian of the person and the property appointed.
5th amendment. "No person... shall be compelled in any criminal case to be a witness against himself."
A competent person is knowledgeable, skilled, and capable of performing tasks effectively. They demonstrate good judgment, problem-solving abilities, and reliability in their work. Competent individuals are usually confident, adaptable, and able to handle challenges with composure.
When a person is competent, they have experience, knowledge, and skill. A person knows they are competent when they take on a task and complete it correctly.