This is NOT true, btw, with the "pre-tests" ie walking a straight line, touching nose, etc. In most states, you CAN refuse due to the lack of effectiveness of such tests in determining intoxication.
[evidence of drunk driving].
Note it is evidence, not proof. Bloodshot, watery eyes is also evidence. Both are refutable and it MUST be proven beyond a reasonable doubt. That is hardly an admission of guilt.