This document summarizes conventional analytical methods for detecting chemical warfare agents. It describes single-dimensional sensors that selectively detect specific compounds, as well as two-dimensional sensors that couple a separation method like gas chromatography, liquid chromatography, or ion mobility spectrometry with selective detection. While single-dimensional sensors can be portable, two-dimensional sensors provide greater precision and detect a broader range of threats. The document recommends using simple two-dimensional methods like gas chromatography or ion mobility spectrometry for on-site screening during inspections to verify the absence of chemical weapons.