[circlecity]

"I suspect they only do that in cases where a driver faces more than just a DUI charge"

Nope. In many states, including mine, they will get an order for a blood draw in every instance where a DUI suspect refuses a breath test.

[Alberta's Child]

That seems pointless and redundant in any state where the refusal to take a breathalyzer test is the equivalent of a guilty plea to a DUI charge.