The detection limits for the spontaneous Raman stand-off detection set up used in the project has been determined for DNT, TNT and ammonium nitrate at the laser wavelengths 532 nm, 355 nm and 266 nm. Stock solutions of the sample materials were prepared. The solvent used for TNT and DNT was acetone, for ammonium nitrate distilled water was used. Small amounts of the solution was then placed in 7 mm wide, 1.6 mm deep holes, in an aluminum plate and are left for approximately 1 h in order for the solvent to evaporate. Thereafter spectra have been recorded during 600 laser pulses. The spectra have been analyzed with computer algorithms made by Blekinge Tekniska Högskola and Lunds Tekniska högskola. The algorithms are still under development and therefore the detection limits are most probably lower than reported here. The detection limit for TNT, DNT and ammonium nitrate is between 100 µg and 1 mg at 532 nm wavelength of the laser. At 355 nm and 266 nm, only ammonium nitrate gave a strong identifiable signal. For these wavelengths the detection limit for ammonium nitrate is between 100 µg and 1 mg. For TNT a weak signal was probably noticed at both 355 nm and 266 nm during the first laser pulses, though too weak to be analyzed. Other groups have showed that it is possible to detect TNT at a wavelength of 266 nm, this implies that something could be essentially different in our set up or sample preparation and this should be investigated further. Except for these substances, also spectra from TATP (~1 g) have been measured at the same wavelengths. The result shows strong visible spectra at 532 nm and 355 nm after only a few accumulations. Also at 266 nm visible spectra has been recorded yet much weaker. A problem that has arisen at some measurements such as those for TATP at 355 and 266 nm is that even though good spectra has been recorded the signal processing have not been able to identify these substances. This is believed to be due to uncertainty in the calibration of the detection instrumentation.