After seeing and listening to both of them on the TV, I came to the conclusion they are both lying. Both trying to act so innocent, it could be they are trying to start acting careers.
The cop, responding to a break in call, has no idea what kind of shit is going to go down. And don't tell me a 5' 6", 150 lb man can't fuck you up... or kill you. So he's on edge, and acting all official and badass out of fear/caution.
The prof, well know and respected in his little circles, feels the cop should take him at his word, and expects polite conversation. He gets pissed when the cop follows him into the house uninvited, even though he hasn't proven who he is or that he should be there, yet. Like the cop is going to let a still suspect just walk away, c'mon.
From there it escalates, with the prof being cocky and the cop getting more pissed at being given a hard time while risking his life to protect the prof's property, and starts acting more hardass.
And the rest is history in the making, by everyone choosing sides while the media plays it to the hilt, interviewing everyone with an axe to grind.