I'm not so certain people will leave glowing positive reviews, or 4-star reviews of cops. "Fantastic service, the interior of the back of the car could have been more clean, I wish I could give this 3.5 stars."
Or, "Gave me directions when I was lost near 9th ave, looking the M&M store. Thanks! 5 stars."
But most likely, "Was rude, yelled at me, and then pushed me up against the wall. 1 star"
This idea is ridiculous. If you want a platform for civilian review, that does exist in some cities. Because, and this evidenced by some of the "how brave" comments below, this is really intended to punish bad cops and call them out. Calling this a Yelp is dishonest. If you want to be honest call it like it is, a complaint area.
In some cities there's a civilian review board, and there's a special section of the DA for investigating bad behavior and illegal behavior. The role of the cop is to enforce laws. Will this idea make them more accountable to those things, or does it exist to create mayhem using technology and an online platform for doxxing? That's not a rhetorical question - it's an honest question and I'm curious what people believe.