Cocaine Cuts: What's Really in Your Cocaine and How to Test for Adulterants

Cocaine Is Almost Never Pure

Multiple studies from drug checking services — including Canada's ANKORS, the UK's WEDINOS, and US-based DrugsData — consistently show that street cocaine is 20-50% pure on average. The remaining 50-80% is adulterants and diluents, some of which are medically dangerous.

The Most Common Cocaine Adulterants

Levamisole

• What it is: A veterinary deworming agent
• Prevalence: Found in 70-80% of cocaine samples tested in North America
• Health risk: Causes agranulocytosis (destruction of white blood cells) and vasculitis — a condition where blood vessels become inflamed and skin tissue dies, leaving permanent purple-black lesions
• Detection: Cannot be detected with standard reagents. Only lab analysis (GC-MS) can identify it.

Phenacetin

• What it is: A banned analgesic (painkiller) withdrawn from the market due to kidney toxicity
• Prevalence: Common in cocaine samples globally
• Health risk: Chronic kidney damage, carcinogenic
• Detection: No reagent test — requires lab analysis

Caffeine

• What it is: The world's most common stimulant, used as a cheap bulking agent
• Prevalence: Ubiquitous in cocaine samples
• Health risk: Increases heart rate and blood pressure — adds stimulant load on top of cocaine
• Detection: No specific reagent test; may produce faint reactions with some reagents

Lidocaine and Benzocaine

• What it is: Local anesthetics that mimic cocaine's numbing effect
• Prevalence: Very common — used to create the illusion of high-purity cocaine
• Health risk: Generally low toxicity at typical amounts, but can mask dangerously pure cocaine by making weak product seem stronger
• Detection: Difficult with reagents; Scott test may produce ambiguous results with benzocaine contamination

Fentanyl

• What it is: A synthetic opioid 50x stronger than heroin
• Prevalence: Increasing — documented in cocaine samples in Canada, the US, and Europe (2024-2025)
• Health risk: Respiratory failure and death at sub-milligram doses. Fentanyl in cocaine is especially dangerous because cocaine users typically have no opioid tolerance.
• Detection: Fentanyl test strips work well on cocaine — dissolve ~10mg in water and test

The Testing Protocol for Cocaine

Step 1: Scott Reagent (Cocaine Confirmatory)

Scott reagent turns blue in the presence of cocaine. This is the most important single test:

• Blue = cocaine likely present
• No blue = not cocaine, or cocaine is below detection threshold

However, Scott is not definitive — lidocaine and benzocaine can produce weak or transient blue reactions.

Step 2: Marquis Reagent (Adulterant Screen)

Marquis screens for amphetamine-type stimulants that may have been added:

• No reaction = no amphetamine/methamphetamine contamination (good)
• Orange/brown = amphetamine or methamphetamine present (not what you want in your cocaine)

Step 3: Mecke Reagent (Secondary Screen)

• No reaction = consistent with cocaine
• Green/blue reaction = possible MDMA or other contaminants

Step 4: Fentanyl Test Strip (Critical)

Dissolve approximately 10mg of cocaine in 1-2 teaspoons of water. Dip the strip for 15 seconds. Wait 2-5 minutes.

• One line = fentanyl detected — DO NOT USE
• Two lines = no fentanyl detected

Test the entire batch, not a sub-sample. Fentanyl does not distribute evenly in powder — the "chocolate chip cookie effect" means one portion may be clean while another contains a lethal dose.

What the Tests Cannot Tell You

• Purity percentage — reagents only indicate presence/absence
• Levamisole contamination — requires lab analysis
• Which specific adulterant — reagents give class-level identification, not specific compound identification

Where to Send Samples for Lab Analysis

• Canada: Get Your Drugs Tested (Vancouver) — free FTIR analysis with mail-in option
• UK: WEDINOS (Cardiff) — free, anonymous, postal
• US: DrugsData (formerly EcstasyData) — fee-based GC-MS analysis
• International: Energy Control (Spain) — international mail-in service

Reagent testing gives you a preliminary answer in minutes. Lab analysis gives you definitive identification in days. Use both when possible.

Sources: ANKORS Drug Checking Data, WEDINOS Annual Reports, DrugsData.org