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I'm Dr Palmer. So scope and most mouth washes contain alcohol which should cause a + Breathalyzer.
Certainly if you drink it you can become intoxicated. But if it was only used (swish spit), the breathylizer can be positive, but to conclude if the patient was intoxicated or now, he/she should have a alcohol level blood test.
This will confirm alcohol intoxication.
But if police watch a person for about 20-30 minutes, then the affect of mouth wash (swish and spit) would then not affect the test. I hope I was able to help you. Rate me and let me know if any questions.