| THC Potency of Tested Cannabis from Federal Seizure and State and Local Eradication Samples, by Type, 1985-2014 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Year | Non-Domestic Samples (Federal Seizures) | Domestic Samples (State and Local Eradication) | ||||||||||
| Type of Cannabis | All Types1 | Type of Cannabis | All Types1 | |||||||||
| Marijuana | Sinsemilla | Marijuana | Sinsemilla | |||||||||
| Potency2 | Number3 | Potency2 | Number3 | Potency2 | Number3 | Potency2 | Number3 | Potency2 | Number3 | Potency2 | Number3 | |
| 1985 | 3.44% | 745 | 7.95% | 12 | 3.48% | 767 | 2.19% | 703 | 7.07% | 40 | 2.22% | 845 |
| 1986 | 2.75% | 711 | 8.78% | 14 | 2.80% | 753 | 1.95% | 661 | 8.16% | 18 | 1.84% | 803 |
| 1987 | 3.16% | 1,110 | 8.29% | 17 | 3.20% | 1,147 | 2.46% | 441 | 7.69% | 26 | 2.38% | 553 |
| 1988 | 3.62% | 1,127 | 8.30% | 29 | 3.70% | 1,171 | 2.20% | 513 | 7.33% | 69 | 2.56% | 651 |
| 1989 | 3.68% | 725 | 7.13% | 29 | 3.78% | 761 | 1.71% | 350 | 6.86% | 57 | 2.00% | 511 |
| 1990 | 3.78% | 756 | 9.59% | 16 | 3.82% | 788 | 2.09% | 352 | 10.29% | 45 | 2.58% | 475 |
| 1991 | 3.18% | 1,498 | 11.20% | 29 | 3.26% | 1,564 | 2.90% | 651 | 10.10% | 46 | 2.57% | 943 |
| 1992 | 3.09% | 2,461 | 9.67% | 33 | 3.16% | 2,515 | 3.05% | 875 | 7.72% | 43 | 2.96% | 1,025 |
| 1993 | 3.67% | 1,994 | 4.64% | 5 | 3.65% | 2,010 | 2.83% | 1,039 | 5.82% | 118 | 2.75% | 1,346 |
| 1994 | 3.76% | 2,052 | 6.92% | 10 | 3.75% | 2,074 | 2.95% | 980 | 7.55% | 94 | 3.02% | 1,210 |
| 1995 | 3.95% | 3,730 | 9.64% | 17 | 3.98% | 3,747 | 2.55% | 701 | 7.26% | 147 | 2.92% | 999 |
| 1996 | 4.41% | 1,377 | 11.30% | 22 | 4.51% | 1,399 | 2.90% | 767 | 8.94% | 146 | 3.48% | 1,029 |
| 1997 | 4.93% | 1,313 | 12.02% | 18 | 5.03% | 1,331 | 3.34% | 954 | 11.50% | 104 | 3.99% | 1,119 |
| 1998 | 4.73% | 1,298 | 11.88% | 87 | 4.93% | 1,335 | 3.36% | 778 | 12.58% | 64 | 3.75% | 922 |
| 1999 | 4.36% | 1,749 | 13.49% | 55 | 4.63% | 1,804 | 3.76% | 691 | 13.31% | 81 | 4.43% | 833 |
| 2000 | 5.10% | 1,861 | 12.87% | 62 | 5.35% | 1,923 | 3.96% | 1,057 | 12.72% | 51 | 4.10% | 1,185 |
| 2001 | 5.77% | 1,587 | 12.05% | 95 | 6.13% | 1,682 | 3.58% | 805 | 7.86% | 140 | 3.97% | 1,009 |
| 2002 | 5.66% | 1,380 | 14.41% | 302 | 7.23% | 1,682 | 3.27% | 409 | 7.29% | 226 | 4.29% | 703 |
| 2003 | 5.62% | 1,516 | 14.00% | 347 | 7.18% | 1,863 | 2.38% | 377 | 7.21% | 191 | 3.67% | 625 |
| 2004 | 6.17% | 1,418 | 14.06% | 485 | 8.18% | 1,903 | 2.55% | 395 | 7.67% | 246 | 4.20% | 694 |
| 2005 | 5.92% | 1,608 | 13.04% | 681 | 8.04% | 2,289 | 2.25% | 354 | 7.78% | 250 | 4.21% | 656 |
| 2006 | 6.49% | 1,409 | 13.59% | 668 | 8.77% | 2,077 | 1.99% | 362 | 6.81% | 364 | 4.15% | 775 |
| 2007 | 7.19% | 1,303 | 13.40% | 833 | 9.61% | 2,136 | 1.92% | 340 | 7.21% | 503 | 4.86% | 883 |
| 2008 | 7.16% | 1,054 | 13.08% | 942 | 9.95% | 1,997 | 1.82% | 302 | 7.53% | 370 | 4.84% | 701 |
| 2009 | 7.13% | 1,026 | 12.36% | 1,043 | 9.75% | 2,069 | 2.43% | 435 | 7.37% | 490 | 4.89% | 962 |
| 2010 | 6.68% | 893 | 12.80% | 1,363 | 10.36% | 2,256 | 2.79% | 290 | 11.84% | 97 | 4.89% | 405 |
| 2011 | 5.60% | 722 | 13.64% | 1,615 | 11.13% | 2,337 | NA | 0 | NA | 0 | NA | 0 |
| 2012 | 6.12% | 546 | 14.48% | 1544 | 12.29% | 2,052 | NA | 0 | NA | 0 | NA | 0 |
| 2013 | 6.31% | 262 | 13.64% | 923 | 11.99% | 1,185 | NA | 0 | NA | 0 | NA | 0 |
| 20144 | 6.13% | 123 | 12.17% | NA | 0 | NA | 0 | NA | 0 | |||
Notes:
No data -- beginning in 2011, no domestic samples were tested.
1 The category "All Types" of cannabis tested includes ditchweed and a small number of Thai sticks.
2 These percentages, indicating potency, are based on simple arithmetic means calculated by dividing the sum of the delta-9THC concentrations of each sample by the number of seizures and are not normalized by weight of seizure.
3 Number of tested samples that yield the potency in prior column.
4 Data for 2014 are preliminary
