As mentioned above, reagents aren't particularly effective for detecting DMT in plant samples. However, if there is a lot in a whole plant extract, or if you do full extraction and get a fairly pure compound, ehrlich seems to do a pretty good job of detecting DMT. I would recommend full scale extractions to as pure an extract as possible and testing with ehrlich over marquis, mecke, p-DMAB-TS, etc... (though these are helpful for follow up testing) for best DMT detection results.