Emergency SOSLocation: Kadara
While driving in the northwest area of the Kadara map (as you will during the Contagion quest, for example), you'll get an emergency SOS over the comm. SAM will produce a navpoint, pointing you to a hillside structure.
Enter the building to find two Terran males in a cognitively altered state.
Scan everything in the room, particularly the plants, then talk to them to discern the nature of the emergency.
This conversation ends the mission, but dovetails with the mission Herbal Entrepreneurs.