Mephedrone

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The latest legal high drug is mephedrone and has never been tested on humans since it was never intended for human use. It is a structural analogue of (S)-cathinone and the term miaow miaow presumably comes from either khat or (S)-cat... . Possibly, there will be someone who would experiment with the herbicide (weedkiller) paraquat if they were told 'it has an effect', albeit a very deadly one, but there's only one way to find out...

Perhaps using an emetic in the khat 
formulation could prove useful

Ingestion of any unknown substance is always dangerous. And to just get a 'high' whether legal of otherwise is simply stupid. It would appear that improper use is just through simple ignorance. The lack of any knowledge about the dangers of such practices. The worrying element with this entire issue is the attitude that permits taking such potentially deadly products. In the proper environment strychnine or potassium cyanide can be useful. For humans they are both deadly.

Reported central nervous system (CNS) activities include euphoria, enhanced confidence and an urge to socialise. These attributes compare with ecstasy (MDMA) which is structurally related to the class A drug methamphetamine, one of the most potent amphetamines (speed). Originally classified under the Misuse of Drugs Act, 1971 as a class B drug (cannabis, amphetamine, codeine and methylphenidate) this was upgraded in 2006 to Class A which includes heroin, cocaine, ecstasy, methamphetamine, LSD and psilocybin mushrooms.

In the UK, drugs are individually specified (ACMD), an independent expert body (quango), rather than by structural similarity as in the US (Federal Analog Act).

United States Code

Use of substances like mephedrone are already banned simply by the nature of structure. The ACMD itself is currently in disarray.