You just did. But it is irrelevant, unless you are hinting at corruption. And that would be naughty enough to earn you a Yuletide holiday.,
Conflict of interest is relevant, without hinting at corruption.
Levi has shown in the past that he is incompetent at doing these measurements (Lugano), and that he trusts what Rossi says. Those two factors make his evidence in this case totally unreliable.