Frequently Asked Questions About Drug Tests & Drug Testing

The information found on this webpage can help answer many frequently asked  questions about drug tests and drug testing.  The questions listed here are constantly updated, expanded, and refined to ensure that you have access to the very latest information.

Why should I use onsite drug test kits for employee drug testing?

Using instant drug test kits provide a fast and affordable solution for drug testing employees. The results can be read in minutes. The instant onsite drug test can get your new employees to work right away. The onsite tests can be used for pre-employment drug testing, random drug testing, post accident drug testing, and reasonable suspicion drug testing. We offer lab confirmation for non-negative results.

Who do I contact about specific questions about drug tests and drug testing.

Feel free to contact us whenever you have a question or need assistance with your products or service.

  • New Account/Customer Services 1-866-323-7336
  • Email questions to customerservice@usscreeningsource.com
  • Contact us online

How long can drug be detected in urine and saliva drug test?

The following chart gives approximate detection periods for each substance by drug test type. The ranges depend on amount and frequency of use, metabolic rate, body mass, age, overall health, drug tolerance, and urine pH.

Drug Cut-Off Level Approximate Detection Time in Urine Approximate Detection Time in Saliva
Amphetamine (AMP) 1,000 ng/ml 2 – 4 Days 1 – 3 Days
Barbiturates (BAR) 300 ng/ml 4 – 7 Days
Benzodiazepines (BZO) 300 ng/ml 3 -7 Days
Cocaine (COC) 300 mg/ml 2 – 4 Days 1 – 3 Days
Ecstasy (MDMA) 500 ng/ml 1 – 3 Days
Methadone (MTD) 300ng/ml 3 – 5 Days
Methamphetamine (MET) 1,000 ng/ml 3 – 5 Days 1 – 3 Days
Opiates (MOR) 300 ng/ml 2 – 4 Days
Opiates (OPI) 2,000 ng/ml 2 – 4 Days 1 – 3 Days
Phencyclidine (PCP) 25 ng/ml 7 – 14 Days 1 – 3 Days
Marijuana (THC) 50 ng/ml 15 – 30 days 6 – 12 Hours
Tri-Cyclic Antidepressants (TCA) 1,000 ng/ml 7 – 10 Days
Propxyphene (PPX) 300 ng/ml 1 – 2 Days
Oxycodone (OXY) 100 ng/ml 2 – 4 Days
Amphetamine (AMP300) 300ng/ml 2 – 4 Days
Cocaine (COC150) 150 ng.ml 2 – 4 Days
Methamphetamine (MET500) 500 ng.ml 3 – 5 Days

 Drug Testing with on-site urine or saliva drug test products provides a preliminary drug test result and should be confirmed  using a laboratory to confirm non-negative drug test results. All non-negative onsite drug test results should be confirmed thru a certified laboratory.

We offer Lab confirmation and MRO service for our clients using our instant drug test products. A Lab confirmation account can be set up for your company. Please contact our customer service department toll free 1-866-323-7336.

What is specimen adulteration?

Adulteration is the tampering of a urine specimen with the intention of altering the test results. Users of illicit drugs have attempted to defeat drug tests by adding adulterants to the sample after collection as a way to invalidate the testing procedure. Adding household chemicals such as detergents, bleach, and soaps or diluting samples by drinking large quantities of liquid are some of the creative ploys that abusers use to mask positive samples. One of the best ways to test for adulteration is to look for certain characteristics such as pH, oxidization, specific gravity, color and temperature. Many techniques have been devised for this purpose, including:

  • Eating or drinking substances that the donor believes will chemically alter drug test results.
  • Adding substances (salt, vinegar, bleach, detergent, Drano, Visine, etc.) directly to the urine sample to chemically alter test results.
  • Diluting the urine sample, e.g., by drinking large amounts of liquid, taking a diuretic to increase urination, or adding water directly to the specimen to lower the concentration of the drug so that it becomes undetectable by the test.
  • Substituting the donor’s specimen with someone else’s drug-free urine.
  • Color – A clear color may indicate that the sample has been watered down. Unadulterated, normal urine should be pale to dark yellow or amber in color. However, a sample should not be considered positive by color alone, but should be suspect for closer examination.
  • Temperature – The temperature os a urine specimen should be between 91 and 98 degrees when checked within 4 minutes of collection. Urine that is submitted at body temperature will exceed 90.50 degrees Fahrenheit. A specimen that fails below that range us suspect.

Drug Test Adulteration Information

How do I use the drug test kits?

 We offer FREE online Training.  Once you’ve completed the device training, take a quiz to test your knowledge of a specific device. If you pass, you’ll receive a Product Training Certificate. Your certificate can be printed from your computer

 How do I know if the drug test is working properly?

A control line will be present if the test is working properly. If a control line does not appear, repeat the test with a new device. Insufficient specimen volume or incorrect procedural techniques are most likely the reasons for control line failure. Review the procedure and repeat the test using a new device. If further assistance is required, please contact Us Screening Source toll-free 1-866-323-7336

What is the shelf life of the drug test kits?

The on-site screening devices have a shelf life of up to 24 months from the date of manufacture. The expiration date is indicated on each individual foil pouch and can be used up until that date. Do not use products past the expiration date. Expired products should be discarded.

Do instant test results hold up in court?

Instant drug tests provide only a preliminary analytical test result. A more specific alternate chemical method must be used in order to obtain a confirmed analytical result- gas chromatography (mass spectrometry) (GC/MS) is the preferred confirmatory method. Any result taken to court must be confirmed by an SAMHSA certified Lab.  We can provide lab confirmation thru a SAMHSA certified Lab and MRO services. Please contact customer service for information.

What is the importance of checking the urine temperature strip on the drug test?

Under normal situations fresh urine will display a temperature between 90 and 100 degrees Fahrenheit on the temperature strip, if read within 4 minutes of the collection. Should the temperature strip not register, the specimen should be immediately re-checked using a new cup (or strip) and the results recorded on the requisition. Specimens with a temperature out of range may indicate a substituted or adulterated sample.

How do the drug test need to be stored? Do they need to be refrigerated?

All drug test devices can be stored at room temperature up to the date of expiration printed on the individual foil pouch. They cannot be stored in extreme heat or cold and must remain sealed in the foil pouch until use.

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