DMT uses the same reagents as LSD, which are Ehrlich and Marquis.
Ehlrich - This reagent would confirm the presence of DMT and its variations such as 5-MeO-DMT. It's a broader test so doesn't indicate presence of both apart. The color would change to pink/pinkish/blue.
Marquis - If the sample contains DMT, the color would change from light to deep orange.