Immunoassay tests are relatively cheaper and fast. They give almost instant results. However, these type of UDS has its drawbacks. Firstly it does not detect all opioids in a sample, meaning it can provide a false negative for a user and secondly it can also give false positives. Immunoassay tests don’t measure the quantity of the drugs in the system. Instead, they measure the antibodies or antigens produces by the body’s immune system as a result of drug interaction.
It is quite unreliable, and for this reason, it is not the final ruling in court cases.
The Gas Chromatograph technique is also known as mass spectrometry. It is much more expensive than the immunoassay. It also takes a much more extended period for the test report to be processed. Each type of drug has a distinct fragmentation pattern. A GC/MS test will identify specific molecules in a urine sample thus ruling out the possibility of a false positive. However, the can give false negatives if there aren’t sufficient molecules to be detected in a given sample.
Here is an average guide to the duration different drugs can take to clear from your urinary tract.
Alcohol- 3-5 days
Cannabis- 7-30 days
Cocaine- 3-4 days
Heroin- 3-4 days
MDMA- 3-4 days
LSD- 1-3 days
Crystal Meth- 3-6 days
Morphine- 2-3 days
Codeine- 1 day
Amphetamines- 1-3 days
Blood tests are the most expensive but also the most accurate types of drug tests. They have the capability of detecting the parent drug. Due to the sensitivity of blood, it is highly unlikely that a sample is prone to contamination. Also, only professionals are qualified to provide results for the tests.
The viability of the testing window is extremely short compared to other testing methods. Blood testing for drugs is commonly asked for in court cases or insurance companies. It is rare that a potential employer asks for a blood testing as it is highly invasive.
Blood tests are the hardest to pass if you have been using drugs, the samples cannot be contaminated, and any tampering can be detected during the tests. Results of the tests also take up to a week, so this method is not for solving quick cases.
Here is a detection window guide to the drugs commonly tested for in blood:
Alcohol: up to 12 hours
Cocaine: up to 2 days
Cannabis: up to 2 weeks
Heroin: Up to 12 hours
Crystal meth: 12 hours
MDMA: 1-2 days
LSD: 2-3 hours
Morphine: 6-8 hours
Methadone: 24-36 hours
Oral Drug Tests
Oral tests are the fastest at getting test results. They test for how recently the person has used drugs. Results can be present even up to two days after drug use. They can test for opioids, cannabis, alcohol, cocaine, meth, benzodiazepines, amphetamines and other illegal and controlled substances. Oral tests are the least invasive and transparency is guaranteed.
The swab is a chemically engineered absorbent paper. The person will place it in their mouth, preferably on the tongue to ensure enough saliva drenches the paper. Depending on the substances present in the person’s mouth, the article will change color or reveal strips on the swab. The test can take about five minutes for conclusive results.
On the other hand, oral fluid drug tests require a spit sample to be delivered to a lab for careful analysis. The detection window for an oral fluid is an average of 24-48 hours. Oral fluid tests use the same criteria as immunoassay tests. They test for the presence of antibodies produce by the body’s immune system reacting against some drugs. This means that oral fluid tests can indeed produce false positives, primarily when the user has interacted with other prescription drugs.…