There is something about Chad, because everytime I see this guy my stomach turns. I think this has probably something to do with that the people in the sheriff's department in the previous seasons were one of the finest people in Twin Peaks.

As soon as I saw him in Episode 9, that feeling returned. 
Sheriff, Hawk and Bobby aren't that keen on him either.

Nice recap of Chad's actions in Twin Peaks:

When Sheriff Frank Truman returned from a fishing trip, Chad described to him a DUI call he responded to.

During a meeting between Sheriff Truman and Deputy Chief Hawk, Chad expressed his skepticism when concerning a message allegedly received by Margaret Lanterman's log. Truman dismissed him after his comments.

While off-duty, he took a bribe from Richard Horne, who had been smoking at the Roadhouse, where the activity was prohibited.

After observing Hawk investigating a stall door, Broxford filled out paperwork. After witnessing an argument between Sheriff and Doris Truman, he made cruel remarks about the latter and their son who had committed suicide.

While on his lunch break soon after, he was kicked out of the conference room by Hawk, Truman, and Deputy Bobby Briggs.

What is up with this guy?

I have a feeling he will participate in something pretty awful later in the season.