A lot of the time in the CSI show (and in real life), blue wavelengths and orange barrier filter glasses are used. The advantage is that when looking for organic stains in bedsheets and clothing, if washed with brightening detergents, the evidence is visible. Under UV, the brightners will cause fluorescence in the fabric, reducing or even elliminating the observable organic fluorescence. Be wary, though, like bags at the airport, many orange glasses look the same, but many do not work -- because they do not have sharp enough cutoff at 465nm (which is what we use).
In carpets and bathrooms, however, the UV is preferred -- since barrier glasses aren't needed, except to improve observed contrast. Same is true for hotel rooms around the switches, thermostats, by the window, and on the walls (and headboards, etc).