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Stop Using Your Face or Thumb to Unlock Your Phone
(gizmodo.com)
This is a most excellent place for technology news and articles.
If the precedent is that unlocking the phone is the same category as fingerprint taking, well, what happens if you refuse to be "coerced" into having your prints taken? Even if the legal precedent isn't fully understood, it looks like the reasoning here isn't based on whether there was physical force applied, but whether the search required the contents of the person's mind.
I do t know about fingerprints but I thought a blood draw required cooperation or court order
In many (if not most) US jurisdictions, operating a vehicle under a driver's license specifically implies consent to a blood draw when under suspicion of impaired driving.