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When using a hair drug test, it will take approximately 5 days after drug usage until traces of the drug become embedded in a person's hair follicles. That process will continue for approximately 90 days. It is possible that traces of the drug can stay in there longer for certain individuals with over 90 days worth of hair growth.
There are no hard and fast rules for determining how long drug metabolites remain present in your system. Variables that affect drug detection times include weight, percentage of body fat, metabolism, frequency, dosage and duration of drug use.
Below is a table that provides data on average drug detection rates in urine.
| Drug | Detection Period |
|---|---|
| Amphetamines - Stimulants | |
| Amphetamine | Up to 72 hours |
| Methamphetamine | Up to 72 hours |
| Barbiturates - Sedative Hypnotics | |
| Amobarbital | 2-4 days |
| Butalbital | 2-4 days |
| Pentobarbital | 2-4 days |
| Phenobarbital | Up to 30 days |
| Secobarbital | 2-4 days |
| Benzodiazepines - Sedative Hypnotics | |
| Diazepam (Valium) | Up to 30 days |
| Chlordiazepoxide (Librium) | Up to 30 days |
| Cannabinoids - Euphoriants | |
| Marijuana - Casual use* | 1-4 days |
| Marijuana - Chronic use* | Up to 14 days |
| Cocaine - Stimulants | |
| Benzoylecgorine | Up to 72 hours |
| Ethanol - Sedative Hypnotics | |
| Alcohol | One hour per ounce |
| Methadone - Narcotic Analgesics | 1-4 days |
| Methaqualone - Sedative Hypnotics | |
| Quaalude | 2-4 days |
| Opiates - Narcotic Analgesic | |
| Codeine | 2-4 days |
| Hydromorphone | 2-4 days |
| Morphine for Heroin | 2-4 days |
| Phencyclidine (PCP) Hallucinogens | |
| Casual use | Up to 4 days |
| Chronic use | Up to 14 days |
*Marijuana has been reliably detected in individuals up to thirty days after use. There have been reports that marijuana has been detected in heavy users up to 57 days after the last use.
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