any member of the subphylum Crustacea (phylum Arthropoda), a group of invertebrate animals consisting of some 45,000 species distributed worldwide. Crabs, lobsters, shrimps, and wood lice are among the best-known crustaceans, but the group also includes an enormous variety of other forms without popular names.
It is thought that infrequent, low-dose users may test positive for Xanax within urine for up to 4 days post-ingestion. Frequent, high-dose users of the drug may test positive for Xanax after a full week post-ingestion via a urinalysis. Results from a urinalysis can be confirmed with technology such as GC/MS.
I was a chronic user of xanax, I took 1.0-1.5 mg for almost a year. I stopped taking them 4 weeks ago suddenly because I felt good doing so. I will get a urine test in a week or two, so 6 weeks will have passed until my test. But a week ago I took 2mg of xanax.