> Does this require a blood test?

Yes. It is pretty standard to do blood tests in both alcohol and drug DUIs.

Alcohol also has the option, which isn't available for drug, to do a more reliable breath test on a machine that can be maintained at the police station. The breathalyzers or "preliminary breath tests" that they have on the side of the road are not admissible at trial and do not detect drugs, so they are just used as a guidepost on whether there is enough reason to send it for a more reliable test.