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Currently, the biggest problem is modified substances, the so-called designer drugs, similar in chemical structure to controlled substances. The changes made in the process of "design" are aimed at increasing the psychoactive effect. Among the new drugs, there are many groups of substances with different chemical structures, including substances with amphetamine-like action (phenylethylamine analogues), opiate-like action (fentanyl and structural analogues), cathinones, piperazines,...