The most common methods of urine testing used today
Firstly, is the most common form of urine testing is EMIT(Enzyme Multiplied Immunoassay Technique).
The EMIT is considered a drug screening, and not an actual drug test. The EMIT is cheap to perform, but still can detect small amounts of drug metabolites in your urine. So the EMIT can detect only drug metabolites.
They are by-products of drugs, not the actual drug itself. Detection level of EMIT is of 50 ng/l of drug metabolites. This means you will fail, if you have 51 ng/l in your urine and if you have 49 ng/l you will pass.
The main problem with EMIT screenings is that they are very inaccurate, and can give off false positive readings up to 25 percents. A false positive means the drug screening shows you as positive for illegal drugs,when you are not a drug user. Because of this inaccuracy, the lab will always do a second, more expensive test if you fail the
EMIT. This back up is an actual drug test, called GC/MS, and is much more accurate.
So, if you pass the EMIT drug screening, in most cases you are clear, and you will not how long does extacy stay in your system
be forced to the GC/MS test (because the lab does not want to spend the money on the more
expensive GC/MS test). However, in some cases they can do both or just the GC/MS test up
front if they wanted to. However, most of the labs today are going to do an EMIT drug screening with a GC/MS back up, with the GC/MS back up done only if you fail the EMIT screening.
Most basic drug screenings will use a 5 panel screening; look for THC, Opiates, Cocaine, PCP,
and Methamphetamines. However some labs can use up to a 10 panel screening that also tests
for Benzodiazepines, Amphetamines, Barbiturates, Methadone, and Morphine.
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