Average THC Content in Seized
Hash Oil Samples (1972 - 2004)

Number of Samples and Average THC Content of Seized Hash Oil
Year Samples Avg THC %
1972 -- --
1973 6 22.00
1974 18 15.34
1975 29 13.09
1976 18 18.82
1977 17 18.89
1978 9 21.31
1979 9 20.91
1980 8 16.56
1981 5 17.45
1982 8 19.88
1983 30 21.36
1984 33 16.75
1985 25 15.08
1986 23 16.51
1987 22 13.36
1988 16 8.52
1989 9 11.96
1990 12 16.60
1991 10 13.07
1992 22 13.85
1993 17 16.52
1994 14 11.57
1995 13 13.23
1996 8 12.82
1997 10 18.20
1998 5 15.78
1999 11 16.21
2000 7 28.58
2001 7 19.44
2002 5 22.51
2003 4 15.54
2004 2 42.51

2004 data includes samples tested through Nov 8, 2004
Source: University of Mississippi, Marijuana Potency Monitoring Project*

* The Marijuana Potency Monitoring project is sponsored by the US National Institute on Drug Abuse. The sources of the numbers quoted here are as follows:
  1. ElSohly, M.A., et al "The Potency of Confiscated Marijuana, Hash Oil, and Hash Oil Over a Ten-Year Period," Journal of Forensic Sciences, Volume 29, No. 2, April 1984, pp. 500-514

  2. ElSohly M.A., et al "Potency Trends of delta-9 THC and Other Cannabinoids in Confiscated Marijuana from 1980-1997, Journal of Forensic Sciences, Volume 45, No. 1, 2000, pp. 24-30

  3. ElSohly M.A. National Center for Natural Products Research, School of Pharmacy, University of Mississippi, Quarterly Report, Potency Monitoring Project, Report #87, Aug 9, 2004 - Nov 8, 2004

Navigate to Other Available Data

THC Content Overview Sinsemilla Marijuana
Hashish Thai Stick Ditchweed

truth: the Anti-drugwar Anti-drugwar Arsenal Accept the $1 Challenge