• Amphetamines (except meth): 12 hours
  • Methamphetamine: 24 hours Barbiturates (except phenobarbital): 1 — 2 days
  • Phenobarbital: 4 — 7 days
  • Benzodiazepines: 6 — 48 hours
  • Cannabis: 2 days
  • Cocaine: 24 hours
  • Codeine: 12 hours
  • Cotinine (a break-down product of nicotine): 2 — 4 days
  • Morphine: 6 hours
  • Heroin: 6 hours
  • LSD: 0 — 3 hours
  • Methadone: unknown
  • PCP: 24 hours