On the one hand, I can see/sort of understand the misapplication and misunderstanding resulting in the arrest. Perhaps that could be an honest mistake and "retraining" may be appropriate.
However, the article says:
Dash cam video obtained by 19 Action News suggests that Smith had little trouble navigating the test. Officer Peters seemed to agree, telling Smith there were only "minor problems" in his test performance.
In his official police report, Peters appears to contradict the dash cam video, saying Smith "loses balance" and "does not follow instructions."
Granted, that is the media's perception of the video, but a flat contradiction seems more like covering your ass and lying than an honest mistake. I'd think that is the biggest issue with the whole event.