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Hello from JustAnswer.
Although the numeric code will vary from one lab to another, the required drug testing for the USCG does not include testing for Xanax or for benzodiazepines as a drug class. Similarly, DOT testing does not include testing for Xanax or for benzodiazepines.
So, if you are prescribed and taking Xanax, the drug will not be detected via this drug testing process.
If I can provide any additional information, please let me know.