And there are no consequences to allowing someone who is high to continue to drive? Suppose you give someone "the benefit of the doubt" and they proceed to run someone over because they're high 5 minutes later. Everyone would blame the cop for malfeasance. There's consequences to erring either way but you see only one side here.
Nonsense. The cops aren't going to lose their jobs, get locked up, have their vehicles towed, have to post bail or be forced to retain lawyers all on their own dimes because they made the wrong, completely objective, judgment call if someone was high or not. Hell that almost never happens when they make the judgment call and freaking shoot someone.
I don't care how trained they are, the above situation HAS happened already and will happen again. All I'm advocating is not locking up innocent people and completely fucking their lives up in the process, if they can't do their jobs without that one simple stipulation then they need to figure out a different way to do said jobs. It would be a bit different if these people were "just" spending a night in jail but it's much much worse than that.
So far as revenue, you might explain how they got revenue from cases which were dismissed, and for which they had to use resources to pursue, including precious lab time. Those cases discussed in that video cost them money. If there is a better alternative for a quick test, this arguably would save them money because every wrongful arrest costs them.
THREE cases got tossed because those three people hired private attorneys. The rest of the poor schmucks who couldn't afford a private attorney and got assigned a public defender who had barely enough time to skim their files took the plea deal for a non-DUI offense, I guaran-fucking-tee it. Hell I'd almost surely take that deal if I was in their shoes and my own public attorney was telling me there was a good chance I'd lose and have a DUI conviction with much stiffer penalties for daring to take it to trial.
Innocent people are railroaded into plea deals every single day in this country, if you don't know that you need to remove your head from a specific orifice. I personally know a guy that was given the choice of a plea deal which he would get probation or taking it to trial and potentially getting 20+ years in jail. Guess what his innocent ass did? Yet that is considered a "win" and a conviction for the justice department...