Average THC Content in Seized
Hashish Samples (1972 - 2004)

Number of Samples and Average THC Content of Seized Hashish
Year Samples Avg THC %
1972 6 0.60
1973 11 1.00
1974 53 0.86
1975 86 2.28
1976 52 3.28
1977 44 1.81
1978 51 2.15
1979 43 2.32
1980 37 2.58
1981 13 2.91
1982 32 2.69
1983 47 5.47
1984 59 5.75
1985 41 6.49
1986 53 2.66
1987 63 2.62
1988 43 3.35
1989 19 7.06
1990 38 5.30
1991 31 5.21
1992 61 5.35
1993 39 6.60
1994 29 4.60
1995 19 3.60
1996 12 2.52
1997 31 8.92
1998 15 5.87
1999 23 4.94
2000 25 4.37
2001 13 8.48
2002 16 9.12
2003 15 9.83
2004 7 11.22

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, Hashish, 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

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