I think the point that people are missing here is that the "needle" being forced is only if they person refuses a voluntary breath or blood test...and they signed away the right to refuse when they applied for and signed there driver's license application. Irreverent is correct, this is called "implied consent". In CA, the vehicle code states:
23612. (a) (1) (A) A person who drives a motor vehicle is deemed to have given his or her consent to chemical testing of his or her blood or breath for the purpose of determining the alcoholic content of his or her blood, if lawfully arrested for an offense allegedly committed in violation of Section 23140, 23152, or 23153. If a blood or breath test, or both, are unavailable, then paragraph (2) of subdivision (d) applies.
I am pretty confident that the rest of the states have similar statutes on the books.