I know Salvia is not one of the NIDA 5, but...

I know salvia divinorum is sold as "not affecting a drug test" and that it is not one of the NIDA 5, and if you use salvia, its not chemically similar to any of the NIDA 5, and you're supposed to be ok with regards to a drug test. But just out of curiosity, i have been trying to find detection times and trying to find out if it is water soluble. Does anyone know anything about detection times and solubility? Also, i figure if a urine sample is tested using GC/MS, would they not be able to identify the salvinorum a in the urine, seeing as how they would have all the substances in the urine broken down chemically? Does the law limit what they can identify? I figure there will be lots of shit chemically broken down, and they will probably just look for the molecular structures of the drugs tested for. Unless they do a toxicology report, right?