Some DMT will be in the liquid. Some may be bound to the tannins which have precipitated under refrigeration. Of course, some of the solids will have been insoluble fine particulates - wood dust, maybe calcium oxalate.
DMT salts are typically very soluble, although several reports suggest that removal of tannins leads to a reduction in the potency of a brew. If you're willing to do a bit of science, the liquid can be decanted away from the sediment and the sediment can be redissolved in boiling, acidic water followed by addition of magnesium oxide to crash out the tannins without taking so much DMT with it. Once the magnesium tannate has precipitated you'll have another solution with maybe some DMT in it.
You can then apply any of a number of methods to determine whether you've recovered any DMT from the precipitated sludge.