Did you guys beware the Ides of March today? ;D
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Actually, I really doubt the fact that he wouldn't give you a breathalizer test would matter. Just think about the open container law--if you're driving with people and there's an open container of alcohol in the car, then everyone is charged with possession/consumption of alcohol regardless if they didn't drink it.
I looked up Hawaii alcohol laws on MADD . . . and there's the Youth Consumption of Alcohol law, but that is usually only applicable with observed drinking, not merely the blood alcohol content. Some states (dunno if Hawaii does or not) have one or more of these eight exceptions:
1. Parent/Guardian Gives Consent
2. Parent/Guardian Is Present
3. Parent/Guardian Role Not Specified
4. Legal Age Spouse
5. In Any Private Location
6. In Private Residence
7. In Parent/Guardian's Home Only
8. Other (Religious, Educational, Medical)
But since you said you weren't drinking, that probably won't matter. Though Youth Possession might . . . Possession refers to a container, not alcohol in the body. The same earlier exceptions apply.
If you do get charged with something though, Hawaii has the Anti-Plea Bargaining, which is a statute, case law or policy that prohibits plea bargaining or reducing an alcohol-related offense to a non-alcohol related offense.
But I mean really, these probably won't apply at all. I mean look at
this. 110 teens were caught at the underage drinking party, but none went to jail and only 62 were charged with alcohol possession. So probably nothing will happen, so don't sweat it.