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The analysis in 1983 of representative samples taken from fruiting tops of seized cannabis plants illicitly grown in 19 localities on the Danish island of Bornholm showed that the average (mean) content of the total tetrahydrocannabinol (Δ 9-tetrahydrocannabinol (THC) + Δ 9-tetra-hydrocannabinolic acid) was approximately 1.55 per cent, ranging from 0.1 to 4.2 per cent. There was no significant difference in the total THC content of cannabis plants from the Danish island of Bornholm and the content found by other authors in cannabis plants grown during the period from 1968 to 1972 in Afghanistan, India, Mexico, South Africa and Thailand. However, studies carried out on fresh cannabis seized on entry into the United Kingdom of Great Britain and Northern Ireland during the period 1975 - 1981 showed a larger content of THC (ranging from 2.3 to 4.9 percent) than in cannabis plants from Bornholm.
