Toxic Cutting Agents

[Diethyl]

There has been some talk of certain suppliers cutting their products , weather or not this is just a matter of purity or a matter of actual cutting of the product Im sure has yet to be proven. Just a few days ago someone brought up this matter of concern to me and the thought occured to me that many toxic effects felt may be the result of poor reactions resulting in toxic impurities or infact the result of toxic active cutting agents. I don't really have any way to prove this with out a qualitative analysis. It would be a great service to us all if someone actually had the facilities to do such an analysis , but Im sure thats not going to happen. Any insight into this issue would be greatly appreciated.