Most people who will tell you what "Works" for passing drug tests have never taken one. I've been on random drug tests since I was 16 and I'm 19 now. I know for a FACT that those setups at GNC work quick. I payed $65 for one that had a 4oz drink and 4 pills, You drink ALOT of water right after you take it, I think they say something like 40-50oz within the hour. With those though, You'll piss neon green till you're system is clear so you'll need atleast 2 days warning before the drug test, Because if the person giving you the drug test sees neon colored piss they'll know exactly what's up. Two days is amazingly quick for marijauna to clear your system seeing as how weed takes the longest to leave your system than ANY other drug.
Just an FYI, I was clean for near 6 months when I decided to take ONE hit at a party, Come to find out I had a drug test a week later, I drank around 5 bottles of water ontop of my normal beverage habits each day and NEARLY failed the drug test. And by nearly I mean on the cup you piss in, There is a little line that shows up next to the name of the drug when your clean, And the line was just barely visible, If my PO didn't know I was stayin straight I would've been in violation of probation.
Also your body type has a big affect on how quickly your body removes toxins. I would have failed the test had I been fat/lazy.
Alcohol 6 hours to 1 day
Amphetamines 1 to 4 days
Barbiturates Short-acting (Allobarbital, Alphenal, Amobarbital, Aprobarbital, Butabarbital, Butalbital, Butethal,
Pentobarbital, Secobarbital): 1 to 4 days
Long-acting (Barbital, Phenobarbital): 2 to 3 weeks
Benzodiazepines Short-term Therapeutic Use: 3 days
Long-term Chronic Use: 4 to 6 weeks
Cocaine 2 to 5 days
LSD 1 to 4 days
Marijuana Casual Use: up to 7 days
Chronic Use: up to 30 days or longer
Note: THC, Marijuana's primary psychoactive ingredient, is stored by the body in fatty lipid tissue. From there, it is slowly released into the bloodstream and urine for up to several weeks. Chronic users and individuals with high body fat count are at the greatest risk of long-term detection.
MDMA (Ecstasy) 1 to 4 days
Mescaline 1 to 4 days
Methadone 1 to 7 days
Methamphetamines 1 to 4 days
Methaqualone up to 14 days
Nicotine 1 to 2 days
Opiates 1 to 4 days
PCP (Phencyclidine) Casual Use: up to 7 days
Chronic Use: up to 30 days
Note: PCP is stored by the body in fatty lipid tissue. From there, it is slowly released into the bloodstream and urine for up to several weeks. Chronic users and individuals with high body fat count are at the greatest risk of long-term detection.
Propoxyphene 1 to 7 days
Psilocybin (Mushrooms) 1 to 3 days
Steroids (Anabolic) Oral: 2 to 3 weeks
Injected: 1 to 3 months
Naldrolene: up to 9 months
Tricyclic Antidepressants 1 to 9 days