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Strongest Xanax strength that I know of is 2 mg (the bars sectioned into little pieces), but that's besides the point. Since a swab test tests for things in your saliva, any drug will not come up for long. I think your best bet is to rinse with mouthwash every 25 minutes or even more often if your test is very soon. But in all honesty you will probably pass it anyway, Alprazolam (the chemical in Xanax) has a very short half life meaning it leaves the system fairly quickly, you could probably even pass a urine test if you kept yourself well hydrated during the last 42 hours. Only thing is if this swab test will be testing for alcohol too then make sure you don't use any mouthwash with alcohol in it because underage drivers have even failed breathalyzer tests because of mouthwashes with alcohol such as Listerine.

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Q: You took one 5 mg zanax 42 hrs before swab test will it be detected?
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