No one can pass a roadside test, it is all up to the ego of the cop. The more busts under his belt, the higher the glory.
Look at the case of the pilot in Colorado, in the same city that tackles an old woman with dementia, so they can have a good laugh at the resulting video.
There was a police department in Utah giving people DUIs left and right who were blowing 0.00 on the breathalyzers.
People were losing their jobs over this.
Getting a DUI today isn't like it was back in the 80s. It's now practically treated the same as a felony conviction. A lot of doors are closed, careers ruined.