The cards represent corruption, self-interest, and selective enforcement of the law. I think a lot of problems would be solved or help accountable for if those issues were resolved.

> be an expression of or give a tangible or visible form to (an idea, quality, or feeling)

The cards "are an expression of" everything wrong with modern policing. Not sure if you are just being pedantic, but this seems to fit.

I think it's a pretty reasonable claim. The cards illustrate the idea that the law is applied unequally, and at the whim of the police officer... which I believe is the root of much of the problems with US policing.

Its a pretty broad claim because a lot of countries have a different idea to america on what modern policing means.