Most probation departments use a standard immunoassay urine test, typically screening for five to twelve substances depending on the jurisdiction and the terms of your supervision. The most common starting point is a 5-panel test that checks for marijuana, cocaine, amphetamines, opiates, and PCP. Many departments have expanded to 10- or 12-panel tests that add benzodiazepines, barbiturates, methadone, oxycodone, and ecstasy (MDMA).
What the Standard Panel Covers
The core five substances on nearly every probation drug test are amphetamines (including methamphetamine), cocaine, marijuana (THC), opioids like codeine and morphine, and PCP. These five have been the baseline for decades and remain the default in most court systems.
Expanded panels layer on additional substances based on what’s relevant to your case or your region’s drug trends. Common additions include benzodiazepines (Xanax, Valium, Klonopin), barbiturates, methadone, oxycodone, hydrocodone, and MDMA. Some jurisdictions also test for buprenorphine, which is used in medication-assisted treatment for opioid addiction.
One notable gap: fentanyl. Despite the scale of the fentanyl crisis, most standard court-ordered drug panels still do not include fentanyl or fentanyl-related compounds. A National Institute of Justice study found that samples considered negative under current mandatory testing practices would have gone undetected for fentanyl use. Some probation departments have begun adding fentanyl to their panels, but it is far from universal. If your supervision order specifically names fentanyl, assume it’s being tested.
How the Test Actually Works
Probation urine tests use a two-step process. The first step is an immunoassay screen, a quick, relatively inexpensive test that flags whether a substance is present above a set threshold. This is the test you take at the probation office or collection site, and results can come back the same day or within a few days.
If the initial screen comes back positive, the sample is sent to a laboratory for confirmatory testing using a more precise method called gas chromatography-mass spectrometry (GC-MS) or liquid chromatography-mass spectrometry (LC-MS/MS). These confirmatory tests identify the exact substance and its concentration, which matters because immunoassay screens can occasionally cross-react with legal substances. For example, certain cold medications containing pseudoephedrine can trigger a positive amphetamine screen that confirmatory testing would then rule out.
Federal guidelines set specific cutoff concentrations that determine what counts as a positive result. For THC, the initial screening cutoff is 50 ng/mL, with confirmation at 15 ng/mL. Cocaine’s screening cutoff is 150 ng/mL. Amphetamines are set at 500 ng/mL for screening and 250 ng/mL for confirmation. These thresholds are designed to catch actual drug use while filtering out trace-level exposure that doesn’t indicate consumption.
Alcohol Testing With EtG
If your probation terms prohibit alcohol, you’ll likely be tested using an EtG (ethyl glucuronide) urine test rather than a standard alcohol screen. Regular alcohol only shows up in urine for about 12 to 24 hours after drinking. EtG is a metabolite your body produces when it processes alcohol, and it sticks around much longer, generally 1 to 2 days and sometimes up to 3 to 5 days depending on the cutoff level the lab uses.
The test is marketed as detecting alcohol use within 80 hours, but that claim has limits. At the commonly used 500 ng/mL cutoff, one study found the test was only reliable for detecting heavy drinking within the past 24 hours. Lower cutoffs increase sensitivity but also raise the chance of flagging incidental alcohol exposure from things like hand sanitizer, mouthwash, or certain foods. The 500 ng/mL cutoff is widely used in probation settings specifically to reduce those incidental calls. If you’re subject to EtG testing, avoiding all alcohol-containing products in the days before a test is the safest approach.
How Long Substances Stay Detectable
Detection windows vary significantly by substance and how frequently you’ve used it. Here are the general timeframes for urine detection:
- Marijuana (THC): 1 to 3 days for occasional use, 5 to 10 days for daily use, and up to 30 days for chronic heavy use
- Cocaine: 1 to 3 days
- Amphetamines and methamphetamine: 2 to 4 days
- Opioids (codeine, morphine): 1 to 3 days
- Methadone: 2 to 4 days
- Benzodiazepines: 3 to 7 days at therapeutic doses, up to 30 days with chronic use
- MDMA (ecstasy): 1 to 5 days
- PCP: 2 to 7 days for a single use, up to 30 days with chronic use
- Barbiturates: 1 to 2 days for short-acting types, 10 to 20 days for long-acting types like phenobarbital
These are estimates. Body weight, metabolism, hydration, and frequency of use all shift the window. Marijuana is the most variable because THC is fat-soluble and accumulates in tissue over time, which is why a daily user can test positive weeks after stopping.
What Happens if You Have a Prescription
If you take a prescribed medication that could trigger a positive result, such as Adderall (amphetamine), Xanax (benzodiazepine), or oxycodone, you’ll need to provide proof of your prescription. The standard process involves a Medical Review Officer (MRO) reviewing the positive result before it’s reported as a violation. The MRO contacts you, verifies the prescription with your pharmacy or doctor, and can reclassify the result as negative if the medication explains the finding.
The key detail: you need a current, valid prescription in your name. A prescription that expired months ago, or medication prescribed to someone else, won’t protect you. Many probation departments also require you to disclose all prescriptions to your probation officer in advance rather than waiting for a positive test to explain it.
Sample Integrity Checks
Probation drug tests aren’t just analyzed for drugs. Labs also run validity checks on the sample itself to detect tampering, substitution, or excessive dilution. These checks measure temperature (collected immediately after you provide the sample), creatinine levels, pH, and specific gravity. A sample that’s too dilute, too acidic, or too alkaline gets flagged.
If a sample comes back as dilute (low creatinine but not low enough to be called substituted), some jurisdictions treat it as a retest. If it comes back as substituted or invalid, with creatinine between 2 and 5 mg/dL and no medical explanation, the next collection will typically be directly observed. Observed collections mean a same-gender monitor watches you produce the sample. This is also standard for return-to-duty and follow-up tests. Attempted tampering, such as bringing adulterants to the collection site or providing a sample outside the normal temperature range (90 to 100°F), can trigger an immediate observed recollection and may be treated as a violation on its own.
Random vs. Scheduled Testing
Most probation departments use random testing rather than a fixed schedule. You may be assigned a color code or call-in number and required to check daily whether your color was selected. If it was, you report for testing that same day, usually within a few hours. Some departments use a phone hotline, others use an app or automated system. Missing your check-in or failing to show up on your designated day is typically treated the same as a positive result.
Testing frequency depends on your risk level and the stage of your supervision. Early in probation or after a violation, you might be tested multiple times per week. As you demonstrate compliance, frequency often decreases to once or twice a month. Your probation officer also has discretion to order a test at any meeting if they have reason to suspect use.