Pharmaceutical counterfeiting is becoming a serious problem all over the world. This paper presents several of the most important methods used to elucidate this problem including near- and mid-infrared spectroscopy, Raman spectroscopy, isotopic characterization, chromatographic and mass spectrometric approaches.

Bunaciu, Andrei A., Şerban Fleschin, and Hassan Y. Aboul-Enein. "Spectroscopic Analytical Methods for Detection of Counterfeit Pharmaceutical Preparations — A Mini-Review." Gazi University Journal Of Science 26, no. 3 (July 2013): 407-417