Is it possible to detect whether an organism has been gene edited (by humans)?
If you had access to the DNA of the organism's parent(s) then you could make an inference about whether the child's genome is consistent with being edited, assuming that the edit was done early enough in the embryo's existence for the edit to be present in all/most of its cells. If the organism is a chimera/mosaic, then it may be possible to detect the edit by comparing different tissues within the organism, and identifying differences which do not look like 'natural' somatic mutations.  However, I don't think we have a good handle yet on what the natural range of somatic mutations looks like, so it might be difficult to assess whether any difference found were of an engineered origin.