Is chemical test evidence required to prove you were driving while impaired or intoxicated?

Yes, and a BAC test is also required.
No, but a breath or blood test is required.
No. The testimony of a police officer about the way you drive, your behavior when arrested is enough.
Yes.
Explanation

Chemical test evidence is not necessary to prove that you were intoxicated or impaired while driving. The testimony of a police officer regarding your driving behavior, as well as your demeanor and appearance at the time of arrest, can be sufficient to convict you, even in the absence of a chemical test.

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