Cathinone, one of the psychoactive agents in khat leaves, is highly unstable and loses its potency within three days of harvesting.
BBC: UK could become 'smuggling hub' for herbal high khat
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The ACMD said there was "no evidence" khat, which consists of the leaves and shoots of a shrub cultivated in the Horn of Africa and the Arabian Peninsula and contains the stimulant cathinone, was directly linked with serious or organised crime.