I have published papers about numerous molecules that probably have psychoactive properties in humans. It seems that many of these are now being manufactured and sold as 'legal highs'. I first became aware that unknown amateur chemists were watching my papers more than a decade ago... Although some of my results have been, shall we say, abused, one cannot know where research ultimately will lead. I strive to find positive things, and when my research is used for negative ends it upsets me... Without my knowledge, MTA was synthesized by others and made into tablets called, appropriately enough, 'flatliners'. Some people who took them died....it left me with a hollow and depressed feeling for some time.