At 2 years post injury, an MRI or CT Scan is of little value unless a neuro exam shows a symptom that indicated the need for imaging. An EEG may be more informative.

A Neuro Psychological Assessment would likely be very informative but a NeuroPsychiatric Exam may be able to identify the cause. He and those close to him need to understand these episodes so proper precautions can be taken.

People with these issues can be easily abused by law enforcement as their behaviors can be considered criminal acts.

He needs to have someone help him write a Medical Emergency note to be attached to his driver's license that explains the physiological causes of his erratic behavior. It could be as simple as "I have a brain injury that can cause me to exhibit erratic behavior. I may not make any sense or I may sound very aggressive. These episodes will pass. Any assistance while I experience these erratic episodes is helpful. My Emergency contacts are : "