How Long Are Drugs Detectable? Complete Detection Chart

21. 12. 2025

Detection Table for All Drugs – Comprehensive Testing Guide

How long does a specific drug stay in the body and what crucial role does the type of drug test play that is used? Detection times can vary significantly not only depending on the substance itself, but also on the frequency of use, amount, individual metabolism, and method of consumption. What is detectable in one person for only a short time may remain detectable in another for several weeks. That's exactly why this complete and comprehensive guide was created to help you better understand what a drug test can actually detect and what it can't. The article serves as a central source of information on drug detection times and clearly explains the differences between urine, blood, saliva, and hair tests, including their advantages, limitations, and proper interpretation of results.

🧪 How Do Drug Detection Times Work?

Drug tests usually don't look for the substance itself, but for its metabolites, which are created when the drug is processed in the body.
This means that:

some substances are detectable only briefly
others accumulate in the body and are released gradually
the same drug can be detectable for hours or weeks, depending on circumstances

📌 There is no single universal detection time that applies to everyone.

📊 Drug Detection Table by Test Type

The values listed below are approximate and are based on common practice, expert sources, and testing experience.

Table: How Long Drugs Are Detectable

Substance	Urine	Blood	Saliva	Hair	Note
THC (cannabis)	1–30+ days	1–24 h	6–48 h	up to 90 days	stored in fat
CBD	usually not	no	no	no	risk with low-quality products
HHC / THC-P	days–weeks	hours	hours–days	unclear	depends on structure
MDMA (ecstasy)	2–4 days	1–2 days	1–2 days	up to 90 days	party drug
Amphetamine	2–5 days	1–2 days	1–3 days	up to 90 days	stimulant
Methamphetamine	3–7 days	1–2 days	1–3 days	up to 90 days	heavy strain
Cocaine	2–4 days	1 day	1–2 days	up to 90 days	rapid metabolism
LSD	usually not	hours	rarely	up to 90 days	standard tests don't detect it
Ketamine	2–4 days	1 day	1–2 days	up to 90 days	anesthetic
Opioids (heroin, tramadol)	2–7 days	1–2 days	1–3 days	up to 90 days	pain / addiction
Benzodiazepines	3–30 days	1–3 days	1–2 days	up to 90 days	long half-life
Alcohol	1–3 days	hours	12–24 h	up to 90 days	EtG tests

💧 Urine Tests – Most Commonly Used Method

Urine drug tests are among the most frequently used testing methods and you'll encounter them at employers, companies, schools, and in home testing. The reason for their widespread use is primarily their long detection window, affordable price, and simple handling.

Urine tests don't look for the active substance itself, but for its metabolites, which are created when the drug breaks down in the body. These metabolites can remain in the organism significantly longer than the actual effects of the drug, especially for substances that are stored in fatty tissue (e.g. THC).

Because of this, a urine test can be positive even several days or weeks after the effects have worn off, especially with regular or long-term use. That's exactly why urine tests are ideal for detecting past use, not for assessing current impairment.

👅 Saliva Tests – Detecting Recent Use

Saliva tests are designed to detect recent drug use, usually within a timeframe of several hours to one day. They are most commonly used during roadside checks, by security forces, or during random workplace screenings.

Unlike urine tests, saliva captures more of the active substance or its immediate residues, not long-term metabolites. A positive result therefore usually means that use occurred relatively recently.

The advantage of saliva tests is their speed, non-invasiveness, and simplicity. The disadvantage is the shorter detection window, which means they may not detect older use.

🩸 Blood Tests – Most Accurate, But with Short Detection Window

Blood tests are considered the most accurate method of drug detection because they directly measure the active substance in the bloodstream, not its metabolites. This is exactly why they can best determine whether a person is currently impaired by a given substance.

They are primarily used:

in traffic accidents
in hospitals
when there is suspicion of acute intoxication

The disadvantage of blood tests is their very short detection window – most substances are detectable only for a few hours, at most one day after use. For this reason, blood tests are not suitable for detecting past use, but serve for immediate assessment of condition.

💇 Hair Tests – Long-Term Usage History

Hair tests are among the methods with the longest detection window. Hair can retain information about drug use up to 90 days back, because metabolites of substances are deposited directly into its structure during hair growth. Once a substance enters the hair, it stays there for the entire duration of its existence.

That's exactly why hair tests are not used for routine checks or for assessing current impairment. They cannot determine the exact time of use, only confirm that use occurred sometime during the given period.

In practice, hair tests are mainly used:

in forensic and legal practice
for long-term monitoring of use
in cases where it's necessary to document behavioral history, not current status

Their advantage is high resistance to manipulation, their disadvantage is higher cost and limited availability.

🔥 Why Do Detection Times Vary So Much?

One of the most common reasons for confusion around drug tests is the fact that detection times are not universal. What disappears in one person within a few hours can remain detectable in another for entire weeks.

Detection is particularly influenced by:

frequency of use (one-time vs. long-term)
amount and strength of substance (concentrates, extracts, strong doses)
body fat, where some substances are stored
body hydration
metabolism speed
form of use (smoking, vaping, edibles, oils)

Therefore, it can happen that two people who used the same substance at the same time have completely different test results. This is not a test error, but a natural difference between human organisms.

⚠️ Myths vs. Reality: What Actually (Doesn't) Affect Tests

There are many myths circulating around drug tests that are often spread as "proven advice." In reality, however, most of them don't work.

"If I drink lots of water, I'll pass." ❌
Excessive dilution can be detected by the test itself.
"Detox drinks guarantee a negative result." ❌
There is no reliable evidence that detox preparations work.
"Exercise will speed it up." ❌
On the contrary – burning fat can temporarily release more metabolites into the blood.

📌 There is no trick that will guarantee a negative drug test result.

🧪 How to Use the Detection Table Correctly?

For the table to be truly useful to you, it's important to interpret it correctly:

always take the stated values as approximate
the result depends on the specific situation and type of test
screening test is not final proof
a positive result doesn't automatically mean guilt or a problem

The table serves as a practical orientation tool, not as a legal or medical verdict.

🔗 Recommended Related Articles

For a deeper understanding of the topic, we also recommend:

How Long Does THC Stay in Your Body
False Positive Drug Test – Causes and Solutions
How Saliva Drug Tests Work

These articles expand on the information in the table and will help you better understand specific situations.

🧾 Summary

Detection times vary significantly depending on substance and test type
Urine tests detect longer-term use
Saliva and blood show more recent consumption
Hair provides an overview of long-term history
There is no universal time valid for everyone

This detection table serves as a practical and comprehensive drug testing guide that will help you better understand test results, their meaning, and limitations.