Here are some simple way to search for case law for foreclosure defense "
1. Read your State Court of Appeals Opinions related to foreclosure. These Opinions usually included case laws approved by Appeal Judges. These are powerful arguments and case law.
2. Read Court House other people foreclosure cases pleadings from your state prominent foreclosure defense lawyers. Read cases dated couple years back to see how did they do to survie so long. Read recent cases to see the new defensive pleadings. Lawsuits case files are public info, you can even make copies of pleadings for research.
3. Go to local library and ask the librarian for this book " Foreclosure, Defenses, Workouts and Mortgage Servicers" by National Consumer Law Center. It has chockful of info about foreclosure defense . All public library should have a copy . The library also have books of how to fight credit card debts collectors. Check them out. It's free.