Drawing blood from a vein for laboratory analysis
Mandatory Blood Draws After McNeely and Villarreal

You had several beers at the local bar.  You know driving is dangerous but you decide to chance it.  Suddenly, a police officer flashes his lights behind you.  You are caught.  Panic sets in. However, things get worse!  The officer informs you this is the non-refusal weekend, and he asks for a blood sample.  You refuse. He takes you to the local hospital and instructs the nurse to extract the blood sample despite your refusal.  He never pursued a warrant.  What are your rights?…