Drug Testing Services

Dallas DNA connection provides Hair Drug Testing, Instant Drug Testing, and Urine Drug Testing

A drug test is a technical analysis of a biological specimen – for example urine, hair, blood, sweat, or oral fluid / saliva – to determine the presence or absence of specified parent drugs or their metabolites. Major uses of drug testing are to detect the presence of performance enhancing steroids in sport or for drugs prohibited by laws, such as cannabis, cocaine and heroin.

Substance abuse takes a heavy toll on American business. Drug use in the workplace costs employers approximately $81 billion each year in lost productivity (U.S. Department of Labor). Left unchecked, drug abuse can seriously compromise the integrity and stability of your workplace.


Consider these statistics:

Nearly 7% of adults employed full-time and 9% of those employed part-time currently use illegal drugs (Substance Abuse and Mental Health Services Administration [SAMHSA]).

More than 70% of substance abusers hold some type of job (American Council of Drug Education).

We offer a full line of lab-based and instant drug-testing products and services that provide the critical information you need to make confident and informed decisions about prospective and current employees.

Our laboratory contact has a reputation as a national leader in drug testing, with full accreditation by leading healthcare institutions and government agencies. We offer a full range of drug-testing options, from standard and customized panels to tests for steroid use and specialized testing of healthcare professionals.

Urine drug screen

When an employer requests a drug test from an employee, or a physician requests a drug test from a patient, the employee or patient is typically instructed to go to a collection site or their home. The patient or employee’s urine is collected at a remote location in a specially designed secure cup, sealed with tamper-resistant tape, and sent to a testing laboratory to be screened for drugs (typically the SAMHSA 5 panel). The first step at the testing site is to split the urine into two aliquots. One aliquot is first screened for drugs using an analyzer that performs immunoassay as the initial screen. If the urine screen is positive then another aliquot of the sample is used to confirm the findings by gas chromatographymass spectrometry (GC-MS) methodology. If requested by the physician or employer, certain drugs are screened for individually; these are generally drugs part of a chemical class that are, for one of many reasons, considered more abuse-prone or of concern. For instance, oxycodone and diamorphine may be tested, both sedative analgesics. If such a test is not requested specifically, the more general test (in the preceding case, the test for opiates) will detect the drugs, but the employer or patient will not have the benefit of the identity of the drug.

Employment-related test results are relayed to an MRO (Medical Review Office) where a medical physician reviews the results. If the result of the screen is negative, the MRO informs the employer that the employee has no detectable drug in the urine. However, if the test result of the immunoassay and GC-MS are non-negative and show a concentration level of parent drug or metabolite above the established limit, the MRO contacts the employee to determine if there is any legitimate reason—such as a medical treatment or prescription. If the test results are for other reasons, the testing laboratory will instead contact the physician who ordered the test.

On-site instant drug testing is becoming more widely used in those jurisdictions allowing it (such as some states of the USA) as a more cost-efficient method of effectively detecting drug abuse amongst employees, as well as in rehabilitation programs to monitor patient progress. These instant tests can be used for both urine and saliva testing. Although the accuracy of such tests varies with the manufacturer, some kits boast extremely high rates of accuracy, correlating closely with laboratory test results.

Alcohol Testing

Offered as laboratory-based urine tests, our alcohol tests provide rapid, accurate, reliable results.

In contrast to other drugs consumed, alcohol is not deposited directly in the hair. For this reason the investigation procedure looks for direct products of ethanol metabolism. The main part of alcohol is oxidized in the human body. This means it is released as water and carbon dioxide. One part of the alcohol reacts with fatty acids to produce esters. The sum of the concentrations of four of these fatty acid ethyl esters (FAEEs: ethyl myristate, ethyl palmitate, ethyl oleate and ethyl stearate) are used as indicators of the alcohol consumption.

Urine testing, one of the most common screening methods, is an accurate and reliable way to detect  alcohol use that occurred within the past 80 hours.

Hair testing

Hair analysis to detect drugs of abuse have been used by courts, and hair testing for alcohol markers is now recognised in judicial systems. There are guidelines for hair testing that have been published by the Society of Hair Testing that specify the markers to be tested for and the cutoff concentrations that need to be tested. Drugs of abuse that can be detected include Cannabis, Cocaine, Amphetamines and drugs such as Mephedrone.

The hair follicle test is growing in popularity because it is less invasive than a urine screen, it is harder to falsify or tamper with the specimen, and the detection window is extended to roughly three months. Hair for testing can be collected from anywhere on the body, so the test can be utilized even when someone is bald or shaves their head. Because body hair grows at a different rate than head hair, some people have made the correlation that drug use can be detected in body hair for up to 12 months

Saliva drug screen / Oral fluid-based drug screen

Saliva / oral fluid-based drug tests can generally detect use during the previous few hours to 1-2 days. THC may only be detectable for less than 12.0 hours in most cases. On site drug tests are allowed per the Department of Labor.

Detection in saliva tests begins almost immediately upon use of the following substances, and lasts for approximately the following times:

NOTE: Saliva tests are poorly sensitive to THC and detection times can vary considerably based on the cutoffs used. In some cases drug use may only be detectable for a few hours.


Drug-testing a blood sample measures whether or not a drug or a metabolite is in the body at a particular time. These types of tests are considered to be the most accurate way of telling if a person is intoxicated. Blood drug tests are not used very often because they need specialized equipment and medically trained administers. These factors make it a more costly testing method.

Depending on how much marijuana was consumed, it can usually be detected in blood tests within six hours of consumption. After six hours has passed, the concentration of marijuana in the blood decreases significantly. It generally disappears completely after 30–90 days.

  • Our Partners
  • American Association of Blood Banks (AABB)
  • ACLASS Accreditation Services
  • ASCLD/LAB-International
  • College of American Pathologists (CAP)