During the period of survey, the number of narcotic drug seizures by the law, especially cannabis resin, has increased considerably. The details on this development are presented. The following main analytical results were obtained: the median concentration of THC in cannabis resin has increased up to 8.6%, in cannabis plants the THC content has fluctuated between 1% and 3%. In the heroin samples since 1982, diamorphin has predominated in the base form; the diamorphin content had dropped to 32%, which is connected with a rise simultaneous in the concentration of noscapine (up to 9%). The concentration of cocaine hydrochloride had diminished at the end of the period to 62%; on the other hand, the amphetamine sulfate content increased to 69%. LSD trips used from 10 to 120 micrograms per trip. Methadone occurred mostly in the form of tablets containing 5 mg methadone hydrochloride.
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