Product PlacementtherealtjHow do we know you're not the T-Rex undermining my efforts?
How do we know you aren't the T-Rex pretending to be a scientest?
Indeed you can't, but I could say the exact same thing about you.
If I turn out to be anyone other then who I'm claiming to be, the real detective will undoubtedly do something about it, the moment he sees what I'm doing.
But then what would he do about it? He couldn't tell anyone, because he had already spent his investigation on you. And if he claimed to be the scientist, people would think he was fake, because you had already claimed to be the scientist.