Question
well I must confess I am a marijuana smoker but may have drug test. 1st what herd would help mask it ? and how is it used.
2nd If I wannted to detox from marijuana for good what is advised and how ? I know I know I should stop but if you could please advise. Please note I have had gastric bypass and cannot have high carbs (refined sugars)or any nsaid type medicine ie NO advil,ibprofen,etc.)

Answer
I dont know of anything that will mask drug use.  

There are some good detox herbs.  Burdock root and red clover aid in cleansing toxins from the bloodstream.  Milk thistle helps to detoxify the liver. St Johns Wort can help with withdrawal symptoms.

There are likely to be nutrients depleted from your system.  Blood work can derermine which nutrients ar lacking.  Then you can begin taking supplements to replace them.