They then have the visible effects of the resultant concoction that they contributed to arrested?
Yup, we should all refuse a glass of wine with dinner, together with nuts, milk, bread containing gluten, soy, shellfish etc.
People have to be responsible for their own actions and understand their own limitations.
What's the betting that the lady won't do it again?
We had a guy kick off, shouting about Arabs and guess what; he was a new convert to Islam. I'd hope that his arrest and the inconvenience will dissuade him from perpetrating a repetition.