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

Note: Ditchweed is also known as wild hemp. By far, the greatest amount of annual marijuana eradication operations involves "ditchweed." But nobody smokes ditchweed -- because it will not get you high.

Number of Samples and Average THC Content of Seized Ditchweed
Year Samples Avg THC %
1972 -- --
1973 -- --
1974 -- --
1975 -- --
1976 -- --
1977 -- --
1978 -- --
1979 -- --
1980 6 0.26
1981 20 0.32
1982 30 0.44
1983 60 0.45
1984 50 0.42
1985 111 0.48
1986 147 0.31
1987 103 0.34
1988 82 0.39
1989 111 0.29
1990 93 0.33
1991 283 0.31
1992 128 0.31
1993 200 0.37
1994 147 0.38
1995 163 0.41
1996 117 0.38
1997 55 0.49
1998 87 0.39
1999 72 0.37
2000 73 0.35
2001 63 0.43
2002 75 0.40
2003 56 0.38
2004 24 0.34

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

Navigate to Other Available Data

THC Content Overview Hash Oil Sinsemilla
Hashish Marijuana Thai Stick

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