Show me the study that scientifically links bloodshot and watery eyes with impairment. Yet, that is going to be in most any testimony of the officer in court on a DUI.Feeling different than normal is not impairment.
From the New York State Mental Hygiene Law:
1. "Intoxicated or impaired person" means a person whose mental or physical functioning is substantially impaired as a result of the presence of alcohol and/or substances in his or her body.
Yes, of course the statement may be used in court - for what exactly I don't know. Simply saying "I feel different" is hardly a sign of impairment.If you want to claim a driver who admits to not feeling normal to a police officer has not made an admission that is going to be used against him in court, I'll have to disagree. From the way you are arguing, it seems the later.
The whole point of all the signs we look at and tests we run is because we cannot see into a person's head to tell if they are impaired. Different in a lesser way because of drugs. When we have a person admitting they are different because of drugs, we only have one thing left to show--lesser. If you can't see how a person's admission helps so we don't have to rely on all the magic stand on one leg guesstimates to prove up some things we need to in court, I can't help you. I suspect it is simply being bored and trying to make an argument.