I suggested that Charisma might be a factor (I used the word "might" in the post even); I didn't say it was one. There was no assumption there.
I have found DNA sampling easy to do and an easy way to find out if a Sim is an alien. Obviously, your experience differs. That does not give you the right to say that I am lying about what I am telling you happens in my game. It is an actual fact that in my game, my Sims have obtained DNA samples from mere acquaintances. It is an actual fact that in my game some DNA samples have revealed that the Sim sampled is an alien.
Stop accusing me of lying etc.
(Thank you for the upgrade info, by the way, as rudely stated as it is - I haven't unlocked the ability to upgrade the Satellite Dish yet.)