Questions about Drug Testing & False Positives
What are False Positives?
A false positive is when a substance tests positive for another compound. Ingestion of poppy seeds for example can indicate a positive result for opiates. GC/MS can distinguish the difference between poppy seeds and opiates.
Common False Positive Substances:
Amphetamines
Ephedrine or Pseudo ephedrine and Ephedrine-based compounds. Typical household [...]

Fluorescence Polarization Immunoassay Drug Test (aka “FPI” Drug Test Method)
This drug screen, distributed widely by Abbot labs, utilizes fluorescence polarization to determine the presence of drugs.
Fluorescent molecules excited by plane polarized light emit light in the same polarized plane if the molecule remains stationary through the excited state. If the molecule tumbles out of the [...]

Probation drug tests are typically screens. These are much cheaper and the individual in question has given up rights that ordinary citizens have. Confirmation via GC/MS isn’t performed and failing the screen won’t necessitate confirmation either. Fail the screen and your P.O. makes the decision to return you to jail, make a recommendation to the [...]

Statistics indicate that you will be required to pass a drug test.
Drug testing for employees has become standard practice. Employers typically screen prospective employees prior to hiring and random drug testing of current employees is the common and accepted method of employers to keep the work environment drug free.
What you should know about drug tests [...]

EMIT Drug Test Urinalysis Test Drug Screen
The most commonly used method of screening for drug use is the five panel, Enzyme Multiple Immunoassay Test. (EMIT) This is commonly referred to in the industry as the 5/50 test or DB 550 and is made by Dade Behring. Five drugs are tested for with the cutoff being [...]

How Long Do Drugs Stay In My System?
There are no concrete answers on how long a drug or series of drugs will stay in one’s system, thus being available to render failed drug test.
If you are extremely active, liposoluble drugs are removed from your system more rapidly than if you are a couch potato. The [...]

There are no hard and fast rules for determining how long drug metabolites remain present in your system. Variables that affect drug detection times include weight, percentage of body fat, metabolism, frequency, dosage and duration of drug use.
Below is a table that provides data on average drug detection rates in urine.
*Marijuana has been reliably [...]