If you eat marijuana how long does it stay in your system?

The second most used explanation of positive test to marijuana is the unknowing ingestion of marijuana tea, brownies prepared with marijuana, or the like was the line of defense that followed passive inhalation. Although studies were carried out to investigate this issue, there was no question that if someone orally ingested cooked marijuana, urinary excretion of -9-THC metabolite would correlate with the amount ingested. The issue was whether the concentrations found in the urine at a specific time after ingestion could be explained in the absence of a detectable biological activity at the time of ingestion. This issue still has no definitive resolution in light of the fact that individuals have explained that there was alcohol consumed with the meals, which could mask the effects of marijuana. So still marijuana ingested in brownies will be detected the same in urine analisis for 31 days.