Yea, they can arrest you if you have the slightest smell of weed on you... And they're completely justified for that and you'd lose. This video really doesn't apply to that though since that dumb shit cop was pushing the "how many drinks did you have" bullshit the entire time until he blew a zero. THEN he switched to the ol weed excuse. Why didn't he question weed during that entire stop beforehand, only doing it AFTER he blew a zero?
He was fishing the entire time. A good lawyer will get him off and probably get him a little money, but i highly doubt this scumbag will be reprimanded.