Then do the blood work.
You have nothing to worry about, right?
A good cop like you probably never lost a refusal DUI trial . Isn’t the fact the suspect refused admissible in your jurisdiction . Doesn’t your state law provide for per se suspension of driving privileges after the arrest and before trial ? Doesn’t your state provide for a lengthy revocation of the license for refusal . Does your state not already provide for the mandatory , by force if necessary , taking of blood sample if the driver was involved in an accident resulting in death or serious bodily injury ? Are there any other Constitutional rights you don’t think the citizens of this country should have ?
Nope.
Nothing except the chain of custody of the sample, or the apathetic (or worse, agenda-driven) lab technician.
The Fifth Amendment is in the Bill of Rights for the same reason as the Second Amendment. To protect you.