incorrect, drawing blood would be a last resort. they will still use the breath test first.
Even then when accused of drunk driving you will go through the soberity test even before a breath test is conducted.
oh food posioning is caused by Bacteria, Viruses, or Parasites and typically takes 8 to 12 hr to show its self. Also if it was from the pizza everyone that ate it would have the same affect.
So if you were sick on Sat why did you tell him you would pick it up on Sun knowing you had food posioning? Or did you just blow him off on Sat and get sick on Sun?