The task of writing legal documents is often easier if one seeks out examples to use as models.
To this end, the Seventh Circuit Court of Appeals provides access to briefs on its website.
Although you cannot search by topic, you can find hundreds of example briefs. The briefs are free and do not require PACER to access them.
To find these briefs, go to the Seventh Circuit Court of Appeals and look on the left side under "case information." Follow the link for "Briefs - 2007 + prior."