254 ARTICLES · UPDATED WEEKLY

News

Field guides, regulatory updates, and product breakdowns from the team behind American Screening Corporation's drug testing supplies.

More from the lab notebook

Page 5 of 22
Can Ibuprofen Cause a False Positive Drug Test?

Aug 20, 2026 ·8 min read

Can Ibuprofen Cause a False Positive Drug Test?

Ibuprofen is one of the most common over the counter pain relievers in the country, and it has a real but limited history of...

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How Random Drug Testing Selection Works: Pools, Rates, and Defensible Draws

Aug 20, 2026 ·9 min read

How Random Drug Testing Selection Works: Pools, Rates, and Defensible Draws

Random drug testing only works if the selection process is genuinely random. That sounds obvious, but it is the single most common weak point...

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How Long Does THC Stay in Your Urine? Occasional vs Daily Use Windows

Aug 20, 2026 ·8 min read

How Long Does THC Stay in Your Urine? Occasional vs Daily Use Windows

Anyone facing a urine drug screen after using cannabis wants one number: how many days until it is clear. The honest answer is that...

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How Long Does Alcohol Stay in Your Urine? EtG, EtS, and Standard Test Windows

Aug 20, 2026 ·9 min read

How Long Does Alcohol Stay in Your Urine? EtG, EtS, and Standard Test Windows

The honest answer depends on what a lab is actually measuring. Unmetabolized ethanol, the alcohol molecule itself, clears from urine within a fairly narrow...

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How Far Back Does a Mouth Swab Drug Test Go?

Aug 20, 2026 ·9 min read

How Far Back Does a Mouth Swab Drug Test Go?

A mouth swab, or oral fluid, drug test looks back a much shorter distance than a urine or hair test. It is built to...

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How Fentanyl Test Strips Work and Where They Are Legal

Aug 20, 2026 ·9 min read

How Fentanyl Test Strips Work and Where They Are Legal

Fentanyl test strips showed up in harm reduction kits and clinic supply closets for two very different reasons. Harm reduction programs hand them to...

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Does Tianeptine Show Up on a Drug Test? The Gas Station Opioid Panels Miss

Aug 20, 2026 ·8 min read

Does Tianeptine Show Up on a Drug Test? The Gas Station Opioid Panels Miss

A patient shows up with pinpoint pupils, slowed breathing, and every sign of opioid intoxication, but the 12-panel cup comes back clean across OPI,...

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Does Hydrocodone Show Up on a Drug Test? Opiate vs Expanded Opioid Panels

Aug 20, 2026 ·7 min read

Does Hydrocodone Show Up on a Drug Test? Opiate vs Expanded Opioid Panels

Hydrocodone shows up on a drug test only if the panel is built to look for it. A classic opiate (OPI) immunoassay is calibrated...

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Construction Industry Drug Testing: Building a Program That Holds Up on Site

Aug 20, 2026 ·9 min read

Construction Industry Drug Testing: Building a Program That Holds Up on Site

A construction site is not an office. Crews work at height, around running equipment, near open trenches, and under deadline pressure from multiple contracts...

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How Long Does Xanax Stay in Your System for a Drug Test

Aug 20, 2026 ·6 min read

How Long Does Xanax Stay in Your System for a Drug Test

Xanax is the brand name most people use for alprazolam, a benzodiazepine prescribed for anxiety and panic disorder. It works by calming abnormal activity...

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Specimen Validity Testing Explained: How Labs Catch Tampered Samples

Aug 20, 2026 ·7 min read

Specimen Validity Testing Explained: How Labs Catch Tampered Samples

Every urine drug test that reaches a certified lab goes through two separate exams. The first looks for drugs and their metabolites. The second,...

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Trazodone and Drug Tests: The False Positives It Can Cause

Aug 20, 2026 ·7 min read

Trazodone and Drug Tests: The False Positives It Can Cause

Trazodone is one of the most widely prescribed sleep aids and antidepressants in the country, and it also happens to be one of the...

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