Drug/substance: Urine: Blood: Hair: Alcohol 3-5 days 10-12 hours 90 days Amphetamines 1-3 days 12 hours 90 days Barbiturates 2-4 days 1-2 days 90 days Benzodiazapines 3-6 weeks 2-3 days 90 days Cannabis 7-30 days 2 weeks 90 days Cocaine 3-4 days 1-2 days 90 days Codeine 1 day 12 hours 90 days Heroin … Continue reading Average Drug Elimination Times