I've never heard of a successful method for fooling an alcosensor but a mouthful of activated charcoal would be a good try. I suspect the officer might not be particularly helpful.
What does the manual say about a suspect having something in his mouth? Can he be required to clear his mouth before blowing?
What if he took a mouthful of fluid and blew that in?
I had a case once where the defendant blew cigarette smoke into the device with a positive result. Got a letter from DSIR later saying it would elevate the reading. The judge shrugged.......
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