So, would it be too much to ask some of our Systems Alliance contacts about his background, since they're likely to have more information on him or know of people who might? I'm not sure if they'd be willing to help with such a small thing, but we are a fairly major supplier for their military and humanity in general, so they might help and their abilities to do background check likely outstrip ours by multiple orders of magnitude. Even if they are unlikely to apply such measures for the greater bulk of their own employees due to resource and other constraints.
Paranoia level 0:
Of course he's suspicious. The guy has used his contacts and skills to get close to you and try to get a job with an up and coming giant.
Paranoia level 1:
Industrial espionage is a thing. Your rivals have pegged your personality perfectly.
Paranoia level 2:
He is a plant, a Systems Alliance plant sent to covertly monitor and direct your dealings with the Citadel to the Alliance's benefit. They already believe the Asari are trying something with Liara. The rogue robots that tried to kill you could only come from the Salarians. Who knows what the Batarians are up to.
Paranoia level 3:
He is a plant, a Systems Alliance plant who reports to the Shadow Broker unknowing to his bosses. With high level access you'll be leaking like a sieve.
Paranoia level 4:
He is a plant, a Systems Alliance plant who reports to the Shadow Broker unknowing to his bosses. Of course he's going to send the juiciest bits to Cerberus. Forget sieves, consider your secrets public knowledge.
Paranoia level 5:
You just met Mordin Solus. Don't worry the Yahg don't know what you're up too. Neither do the monkey birds on the cotton-fungus planet.
Paranoia level 6:
This is a Batarian ploy to get their hands on your tech. The newest tech.
Paranoia level 7:
Bow to your robotic overlords!
Paranoia level 8:
The Illusive Man is in da house.
Paranoia level 9:
He works for the Collectors.
Paranoia level 10:
The monkey birds from Planet Bob know
everything.