Cop needs more than reasonable articulable suspicion to make an arrest. He needs something called "probable cause". Refusing to participate in FSTs and/or a preliminary breath test, by itself, is not probable cause.
Again, cause for a traffic stop. Not for an arrest, which probable cause is needed.
Now, if you refuse FSTs, preliminary breath test, AND you have alcohol on your breath, now they have probable cause.
"Oh well they can just say they smelled alcohol". What happens when your test comes back 100% clean? You now have grounds for a law suit because the officer wrongfully arrested you without probable cause (which negates their qualified immunity).
I absolutely will.
Do cops arrest without probable cause? All the time. Because people don't contest it. That's why they keep getting away with it because people these days don't fully know their rights. If everyone started learning and exercising their rights, this would be a lot less of an issue.