How do I clean my system off Marijuana?

Dear Ask The Doctor: Hi my name is Andrew Bishop. I'm 25 6'1" 180Lbs. I was a cronic user of marijuana up until i recieved a job offer and now I'm faced with a drug and alcohol test. I stop smoking it 4 days ago. I'm to start this job April 28. They need the results before then. What can i do to clean my system? And is there even enough time to pass this test?

Dear Andrew: The active ingredient in marijuana, THC, is stored in fat tissues for long periods (weeks to months), and slowly released for longer periods. The time taken for it to clear from the system varies with individuals, and depends on amount and frequency of use, metabolic rate, body mass, age, overall health, drug tolerance, and urine pH of each individual. It may take up to 30 days to clear from your system, perhaps more depending on the various factors mentioned above. The surest way to clean your system is with time, but you may try to speed up the process by increasing fluid intake to flush it out of the system, exercise to increase your metabolism rate and burn fat so that the stored THC may be released faster and can be flushed out of the body.