Uniform language in every state since about 1993.
The purpose of the field sobriety tests is to provide evidence to convict even if the perpetrator / victim tests out below the illegal per se limit.
Most people don't realize that while we can still purchase booze in this country, we just can't risk consuming it or transporting it - anywhere.
We have de facto prohibition. Thank you, MADD.
My favorite is how they got Bill Klinton to support lowering the federally supported BAL (probably some body fluids changed ‘hands’ I assume), then they claim in their fundraising that “drunk driving has increased xx%”. Ought to be in jail for fraud, right next to the people who claimed obesity was up after IT was redefined.