Check iT! has again identified a number of unexpected substances of health concern in the last two analyses. For the first time in September Methyl ethyl cathinone (4-MEC) was analysed in a substance purchased as mescaline and the substance was also present in the last test in October. We also analysed the piperazine derivative para-Fluorophenylpiperazine (pFPP) identified. For a detailed description of the October warnings click here. You can find the September warnings here.