ClearPreferred Diagnostics provides fast, defensible drug and alcohol testing across 3,200+ collection centers nationwide. Same-day negative results. MRO-reviewed. Secure online portal.
From pre-employment screening to court-ordered monitoring, ClearPreferred combines clinical rigor with a frictionless customer experience.
Negative results in under 24 hours. Lab-confirmed positives within 48–72 hours, including MRO physician review.
End-to-end encrypted, HIPAA-compliant access to your results, chain-of-custody forms, and downloadable MRO reports.
3,200+ collection sites across all 50 states. Walk-in or scheduled appointments, often within hours of your order.
Strict chain-of-custody, observed collection, and MRO sign-off make ClearPreferred results admissible nationwide.
Random-pool management, DOT consortium administration, and reasonable-suspicion training — all in one dashboard.
Serving over 40,000 employers, hundreds of court systems, and millions of individuals since 2010.
Comprehensive screening panels for every need.
Standard pre-employment screen. Detects THC, cocaine, opiates, PCP, amphetamines.
$45Extended screen adding benzodiazepines, barbiturates, methadone, propoxyphene, methaqualone.
$65DOT-regulated screen for CDL drivers and safety-sensitive roles. 49 CFR Part 40 compliant.
$55Detects historical drug use up to 90 days back. Cannot be diluted or substituted.
$95Observed collection, 24–72 hour window. Ideal for reasonable-suspicion or post-accident testing.
$50Ethyl glucuronide testing detects alcohol consumption up to 80 hours.
$60DOT-evidential breath alcohol testing by certified BAT technicians.
$40Includes synthetic opioids (fentanyl, tramadol) and synthetic cannabinoids (K2/Spice).
$853–6 month detection window. Tamper-resistant collection from fingernail or toenail.
$1153,200+ locations nationwide. Most accept walk-ins during business hours.
Workplace drug testing has become an integral part of modern employment screening in the United States, with an estimated 56% of employers conducting some form of pre-employment or ongoing testing. Yet for both employers and the individuals being tested, the process is often poorly understood.
Despite the common phrase "drug test," most screens do not test for drugs themselves. Rather, they test for metabolites — the chemical byproducts that remain in your body after your liver processes a substance. This distinction matters because metabolites can persist long after a drug's psychoactive effects have worn off.
For example, the principal metabolite of THC (carboxy-THC) is fat-soluble and can be detected in urine for up to 30 days in regular cannabis users, even though the impairing effects of cannabis typically subside within several hours.
"A positive test does not, on its own, indicate impairment at the time of the test. It indicates exposure within a specific detection window."
| Substance | Urine | Oral Fluid | Hair |
|---|---|---|---|
| Cannabis (THC) | 3–30 days | 1–24 hours | up to 90 days |
| Cocaine | 2–4 days | 1–2 days | up to 90 days |
| Opiates | 2–4 days | 1–3 days | up to 90 days |
| Amphetamines | 2–4 days | 1–3 days | up to 90 days |
| Benzodiazepines | 3–7 days | 1–3 days | up to 90 days |
| Alcohol (EtG) | up to 80 hours | 12–24 hours | up to 90 days |
Federally regulated drug tests follow a two-step model. The first step is an immunoassay screen, a rapid antibody-based test that detects whether metabolites are present at or above a defined cutoff concentration. If a screen is non-negative, the specimen advances to step two: gas chromatography/mass spectrometry (GC/MS), which identifies each compound with near-absolute specificity.
Before a confirmed positive is reported, federally regulated tests require review by a Medical Review Officer — a licensed physician trained in substance abuse and toxicology. The MRO contacts the donor to determine whether a legitimate medical explanation exists.
Every specimen is tracked from the moment of collection to final lab disposition via a chain-of-custody form. Any break in chain of custody renders the result inadmissible.
Myth: Drinking lots of water before a test will produce a negative result. Excessive hydration produces a dilute specimen, which most labs flag as invalid and require to be repeated under observation.
Myth: Secondhand cannabis smoke can cause a positive THC test. Under realistic exposure conditions, secondhand smoke produces metabolite concentrations well below the 50 ng/mL screening cutoff.
This article is provided for educational purposes and does not constitute medical or legal advice.
Trusted by employers, courts, and clinicians since 2010.
ClearPreferred Diagnostics has been providing accurate, confidential drug and alcohol screening for over 15 years. We partner with employers, government agencies, healthcare providers, attorneys, and individuals to deliver fast, defensible results — backed by SAMHSA-certified laboratories and licensed Medical Review Officers.
Access your full testing history, download MRO-reviewed PDF reports, and manage your account from any device — protected by HIPAA-compliant encryption.
One account gives you access to every test result tied to your name — past, present, and future — across all 3,200+ ClearPreferred collection centers nationwide.
Submit your information below. Our intake team reviews each application and will contact you shortly with next steps.
| Order # | Date Collected | Test Type | Result | MRO | Report |
|---|
You can grant a trusted person (family member, attorney, employer's HR) view-only access to a specific result. They will receive a secure link, must e-sign an acknowledgment of confidentiality, and cannot re-share the result.
Patient ID: —
Email: —
For privacy and HIPAA compliance, your personal identifying information is masked in this view. Your full record is on file with your account administrator.
We collect information you submit when you apply for access (name, date of birth, email), test order information, and protected health information (PHI) from authorized testing facilities. We also collect minimal technical information necessary to operate the site (IP, browser type).
We use your information solely to: (a) provide drug and alcohol testing coordination services, (b) maintain your patient portal account, (c) communicate with you about your account and test results, and (d) comply with applicable law.
We do not sell your personal or health information. We share information only with: testing laboratories you are routed to for specimen processing, Medical Review Officers reviewing results, parties you specifically authorize via our Share Results feature (with your written e-signed consent), and as required by law.
You may request access to, correction of, or deletion of your information at any time by emailing [email protected]. You may revoke any share you previously granted from your dashboard.
We use industry-standard encryption (TLS) in transit and access controls for data at rest. No system is perfectly secure; we encourage you to use a strong, unique password.
Privacy questions: [email protected]
This notice describes how medical information about you may be used and disclosed and how you can get access to this information. Please review it carefully.
ClearPreferred Diagnostics is committed to protecting your protected health information (PHI). We are required by law to maintain the privacy of your PHI, to provide you with this Notice of our legal duties and privacy practices, and to follow the terms of the Notice currently in effect.
Treatment. We may use and disclose your PHI to provide, coordinate, or manage your testing services.
Payment. We may use and disclose your PHI to obtain payment for the services we provide.
Operations. We may use and disclose your PHI for our healthcare operations, including quality assessment and improvement.
Authorization. Other uses and disclosures will be made only with your written authorization, which you may revoke in writing at any time.
If you believe your privacy rights have been violated, you may file a complaint with us at [email protected] or with the U.S. Department of Health and Human Services, Office for Civil Rights.
By using ClearPreferred Diagnostics ("we", "our"), you agree to these Terms. If you do not agree, do not use the service.
You must be 18 or older (or have parental consent) and submit truthful information. Accounts are subject to approval by our intake team. We may suspend or terminate accounts for any violation of these Terms or applicable law.
We coordinate drug and alcohol testing services through partner laboratories and collection facilities. We do not perform testing ourselves. Results, chain-of-custody, and Medical Review Officer review are provided through our partners under their applicable certifications.
You agree not to: misrepresent your identity, share account credentials, attempt to forge or alter test results, use the service for any unlawful purpose, or interfere with the operation of the service.
If you share your results with another person, that person must e-sign an acknowledgment before viewing. Recipients are prohibited from redistributing your results. You may revoke shared access at any time.
Where fees apply, all sales are final once a test is collected. Tests not collected within 30 days of order may be voided without refund.
To the maximum extent permitted by law, ClearPreferred Diagnostics shall not be liable for indirect, incidental, special, or consequential damages. Our total liability for any claim shall not exceed the amount you paid us in the 12 months preceding the claim.
The service is provided "as is" without warranties of any kind. Test results are produced by certified third-party laboratories; we do not warrant the accuracy of those results.
These Terms are governed by the laws of the State of New Jersey, without regard to conflict of law principles.
Review and approve patient applications. Approved accounts can sign in immediately.
has shared a drug test result with you (order —).