What's the best way to format this sentence?

Question

Does a comma belong before the word "which" in the following sentence? Also, could it be worded differently for better phrasing?

Police officers often see this law as their own first amendment, which is the main problem with it.

Answer 1

The comma does belong there, but I might rewrite it as: The main problem with this law is that police officers often see it as their own First Amendment.

Answer 2

I think that the way you have it written is fine!