Harm Reduction. Staying hydrated is very important when dancing, drink water to prevent Heatstroke, and replenish your electrolytes with salty snacks! http://rollsafe.org This is a GREAT website has a lot of info. MAOI Antidepressants should never be taken with MDMA, it can cause Serotonin syndrome. read more
MDMA does have a smell that drug dogs can detect and be taught to alert their handlers about. Depending on where you are, the dogs used by local enforcement might or might not have been taught about MDMA. Each drug has to be taught separately, and sometimes other drugs are higher priority for law enforcement (opiates, marijuana, methamphetamine). read more