One characteristic of the Dopterians is that neither they nor the Ferengi can be empathically sensed by a Betazoid.
A Dopterian stole Lwaxana Troi's precious latinum hair brooch on Deep Space 9 in 2369, but she was unable to sense any feeling of guilt from the thief for this reason.
The Forsaken [DS9]
Gorta was a Dopterian accomplice to the Duras sisters' magnesite ore mining operation on Kalla III in 2370.
