"I assumed you were responding to the last thing I said, as your grammar would work out. You did not clarify otherwise. (The Satellite Dish, by the way, hasn't done that in my game yet, though I've used it nearly every Sim day for the last four Sim weeks, on lots that turned out later to have undetected aliens on them. I'll be interested to see under what circumstances it does.)
My point about DNA testing remains: it will detect aliens.
FWIW, you'll get more help from people on this forum if you don't make a habit of being rude."
I don't need any help, I just suggested an idea, and here you come bullshitting and making excuses both for developers and your own mistakes. But I'll help you - you must UPGRADE the Satellite Dish and then it will have an SEPARATE option - Detect Aliens. Detects every single alien around.
Another failed assumption from you I just checked - charisma has nothing to do with taking DNA sample. I have level 10 and still can't take it even with 50% relationships and good moods on both sides. If it really works for you, which I now doubt, it must be because of some personality trait, not because of charisma skill.
Your point has no value just as DNA sample. The fact is it is too hard to get, it provides no valuable info as everything is known beforehand or there is much easier way to get that info.