Hair Follicle Alcohol Test: Detection Window and How EtG/FAEE Testing Works
Hair follicle alcohol tests look back ~3 months on a 3 cm scalp sample (SoHT 2019): EtG/FAEE cutoffs, bleach pitfalls, plus a free lookback calculator.
Guides & Explainers
Driving License Points & ETG Testing Guides
Plain-English articles on demerit points, suspension risk, insurance surcharges, and ETG alcohol testing — each guide links to the free calculator that answers your question.
Alcohol tests: EtG, PEth, hair, and BAC
Start here to match a detection clock, then open the guide that names your test.
How long alcohol stays in your system (EtG, PEth, hair, BAC) →
- EtG urine test: what to expect at the lab
- EtG detection time chart (100 / 300 / 500)
- EtG vs breathalyzer, blood, and hair — compared
- PEth vs EtG: which alcohol test is which
- PEth cutoff levels (20 / 50 / 200 ng/mL) explained
- Hair follicle alcohol test: how far back it looks
- Can mouthwash or sanitizer trigger EtG?
- EtG half-life: how the level falls over time
- EtG after several drinking nights
- Passing an EtG test in 48 hours — what is realistic
- How long to sober up after drinking
- BAC legal limits by country and licence type
License points: expiry, suspension, and insurance
Start here for how long points last, then open the jurisdiction that issued the ticket.
When do license points expire? A plain-English checker guide →
- New York license points and suspension
- Florida license points and suspension
- California 4 points: what a DMV review means
- Ontario demerit points and suspension
- Canada demerit points: Ontario, BC, Alberta
- UK speeding points: when they expire
- NSW new vs experienced driver points
- Texas driver responsibility surcharges
- How insurers use your violation record
- Do license points raise insurance premiums?
EtG Urine Test: How It Works, Cutoffs, and What Can Cause a False Positive
EtG urine test: 100 vs 300 vs 500 ng/mL cutoffs, dilute creatinine flags, incidental ethanol vs drinking, plus a free urine calculator.
When Do License Points Expire? USA, UK, Canada & Australia Compared
When do license points expire in the USA first, then UK, Canada, and Australia? State windows, country guides, and why insurers may look longer than DMV math.
How Long Does Alcohol Stay in Your System? Blood, Urine, Breath, Saliva & Hair
How long alcohol stays in urine, blood, breath, saliva, and hair — EtG vs ethanol clocks, 100/300/500 ng/mL cutoffs, and free detection calculators.
EtG Detection Time Chart: Hours to Clear 100, 300, 500 ng/mL
EtG detection time chart: modeled hours to clear 100, 300, and 500 ng/mL by drink count — a biphasic estimate, not a lab result. Free tool on CalcGrain.
EtG vs Breathalyzer vs Blood vs Hair: Which Test Detects What
EtG vs breathalyzer vs blood vs hair: which alcohol test fits DUI stops, probation, or work screens — windows, cutoffs, and the matching CalcGrain tools.
PEth vs EtG Alcohol Test: Which One Fits Your Situation?
PEth vs EtG: urine days at 100/300/500 ng/mL versus blood weeks at 20/50/200 ng/mL — which programs order, why one can fail alone. Free CalcGrain tools.
Can Mouthwash or Hand Sanitizer Cause a False Positive EtG Test?
Can mouthwash or hand sanitizer cause a false positive EtG? Incidental ethanol vs the 100 ng/mL cutoff — product-by-product, not an excuse for drinking.
Florida License Points: How Many Before Suspension
Florida license points: 12 in 12 months (30-day suspension), 18 in 18 months, 24 in 36 months — FLHSMV thresholds, common ticket points, and calculators.
New York License Points: How Many Before Suspension
New York license points: 11 in 24 months may suspend after 16 Feb 2026. NY DMV speeding table, 11-point alcohol hits, free calculators.
Ontario Demerit Points: How Many Before Suspension
Ontario demerit points stay 2 years from the offence date; 15 points suspends a full licence for 30 days. Warnings, novice rules, and free calculators.
How Long Do Demerit Points Stay on Your Licence in Canada?
Canada demerit points compared for Ontario, BC, and Alberta: two-year clocks, 15-point lines, ICBC premiums, and CalcGrain points tools. Ministry links.
PEth Test Cutoff Levels Explained: 20, 50, 200 ng/mL and What They Mean
What 20, 50, and 200 ng/mL PEth test cutoff levels usually mean, how long the marker lasts, and a free blood-test projector you can run today.
BAC Legal Limits by Country and License Type: 2026 Guide
Compare BAC legal limit rules for the US, UK, Canada, and Australia by license type, then estimate drinks versus the line with a free calculator.
ETG Half-Life Explained: How Fast Does Ethyl Glucuronide Clear?
How ETG half life and biphasic decay shape clearance, why detox kits fail, and a free projector for a known laboratory ng/mL result.
ETG After Multiple Drinking Sessions: Why Timing and Accumulation Matter
How multiple drinking sessions stack leftover metabolites across nights — timing, accumulation, and how to log drinks in the calculator.
How Long Does It Take to Sober Up? What Actually Works (and What Doesn't)
How long to sober up after drinking: ~0.015% BAC per hour after peak, why coffee fails, and a free countdown calculator.
How Insurers Actually Use Your Violation Record (Not Just Your License Points)
How insurers use violation records is not the same as DMV points. See how a speeding ticket can still change a renewal premium.
Can You Pass an EtG Test in 48 Hours? The Science-Backed Truth
Can you pass EtG test in 48 hours? Light drinking may clear a 500 ng/mL line; binge drinking often needs 72–80 hours. Model it — do not guess.
Texas Driver Responsibility Surcharges: What Actually Triggers Them
Texas driver responsibility surcharges vs DPS points: what used to cost extra, what the 36-month point count still does, and how to estimate risk.
NSW Demerit Points for New vs. Experienced Drivers
NSW new vs experienced demerit limits: P1 at 4 points, P2 at 7, full licence at 13 in three years — why the same ticket hits a P-plater first.
Do Points Actually Raise Your Insurance Premium?
Insurance points premium hikes after a ticket: carriers often price the violation, not the DMV point, and surcharges can last years.
How Long Do Speeding Points Stay on Your UK Licence?
UK speeding points expiry under DVLA rules: 4-year vs 11-year endorsements, totting-up at 12 points, and when insurers still care.
What Happens if You Get 4 Points in California?
California 4 points in 12 months can trigger a DMV negligent-operator review — how the count works, 1- vs 2-point tickets, and how to check your risk.