Fluorecence is always a problem for Raman. Usually the easiest solution is to change the laser wavelength, if you can. Do you have a 532 laser wavelength you can try? Although MDMA is fluorescent I would think with a 784 wavelength the contamination shouldn't be significant. Probably 532 excitation will be worse.
It may be helpful to better understand what you me by "analysis". If the sample has other stuff in it, PL contamination may be coming from contaminants, not the primary analyte.
The Raman effect is also very weak. Proper sample preparation is important. A typical method is to crush finely and sprinkle over a low background substrate like aluminum foil.
By the way, a forum policy here is to not discuss certain aspects of illicit drug development, synthesis, and purification. Depending on where you take this thread, don't be surprised if it is shut down.