Neutrophils. A type of immune cell that is one of the first cell types to travel to the site of an infection. Neutrophils help fight infection by ingesting microorganisms and releasing enzymes that kill the microorganisms. A neutrophil is a type of white blood cell, a type of granulocyte, and a type of phagocyte.
If you exclude the spouse with the DUI from your policy your insurance would not cover that person if they were involved in an incident in your car. If you are concerned about liability for his driving habits, a better way would be to obtain legal advice as to car ownership with him and to act on that.
With regard to whether Medicare requires you to keep your private insurance coverage for your husband, the answer is no. He has a right to his Medicare coverage regardless of what other insurance might be available to him. If he drops out of your private insurance coverage, Medicare will become his primary insurance. If you drop his private insurance coverage, he can get prescription drug coverage in either of two ways through Medicare. He could enroll in a Medicare Part C Medicare Advantage plan that includes drug coverage.