There is no best, they are all useless and do nothing but mask what is in your urine. If the sample is sent to a lab then they will find it regarless of what your try to use to flush it out. Vinegar...
The liver processes most drugs, although the efficacy of a drug is also determined by its effectiveness to reach the target area desired. For instance membranes play a large part in passage of...
There are test which will specify the type of drug one has taken. Some simply say the category of drug taken. If you are looking for a specific drug, a test can definitely be done