Cops Who Don't Know When To Stop

Some underage kids in Wisconsin had a kegger party - with a strictly root beer keg.

The cops showed up and made 91 kids take breathalyzer tests. All passed. The police chief explained:

"It was a tremendous waste of time and manpower, but we still had a job to do, and our officers did it," Joling said. "If one kid had come there, even hadn't drank there, but had come there and had been drinking and had left and crashed and burned, then what would the sentiment be? Why didn't the police check everybody out?"

Was this a job that needed to be done?
Testing root beer drinkers, one by one?