The half-life of clonazepam is 20-60 hours. So worse case scenario after 60 hours you'll still have 1mg in your system. After another 60 hours only 0.5mg and 60 hours later about 0.25mg and 0.125mg after a total of 240 hours,...etc. I don't know how sensitive drug tests are, but I'm guessing it could take 14 or more days for plasma levels to drop below the detection limit.
If you have been prescribed this benzodiazepine for medical reasons then you should be declaring it. If not then you are risking both your health and your liberty.
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