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How Long Drugs Can Be Detected
How long a drug can be detected once it enters the body depends on a person's metabolism, individual body chemistry, and fluid intake (the more fluids you drink, the weaker your sample). Different urine tests also have varying thresholds to indicate a positive sample. The following figures indicate the range for light to heavy use:
Marijuana .................
Amphetamines .........
Barbiturates ..............
Cocaine ....................
Codeine ....................
Methadone ...............
Opiates .....................
PCP "Angel Dust"......
Phenobarbital ..........
Quaaludes ................
LSD, XTC ..................
5-30 days*
2-3 days
2-7 days
2-3 days
2-5 days
3-5 days
2-4 days
10-14 days
10-20 days
8-20 days
Not Detectable**

* Marijuana. The recommended testing threshold for marijuana has been lowered to 50 nanograms from 100 nanograms, to catch more smokers. At the lower level some have tested positive over thirty days. Any drugs containing ibuprofen or other non steroidal anti inflammatories often taken for sport injuries can test positive at the 20 nanogram level. Some employers and government agencies still use the 20 nanogram test.

** Psychedelics and mushrooms are not detectable by basic tests.
WHAT ESCAPES THE TEST ?
Remember, the two most widely abused drugs in the United States are not subject to search in government mandated drug procedures. Alcohol. Studies show that alcohol causes approximately eight times the loss of productivity, and personal disability than all illegal drugs combined. Nicotine. Over four hundred thousand cancer deaths per year can be linked to cigarette smoking. Yet the government subsidizes tobacco farming. Hallucinogens. This family of euphorics including LSD, Mescaline, and psychedelic mushrooms, are not regularly part of the test. They're only detected by the sophisticated GC/MS test.

A person could have four Martinis at lunch, chain smoke a pack of cigarettes, drop two tablets of LSD and pass the initial drug screen with flying colors.