That's generally true: you "waive" certain defenses if you don't state them, at certain points in the litigation process. That said, at the most important mome

That's generally true: you "waive" certain defenses if you don't state them, at certain points in the litigation process. That said, at the most important moments, typically lawyers will focus on the 3-or-so 'best' (in their view) defenses and focus on those. Then if you lose, you can appeal and say the judge didn't consider your 15th-best defense closely enough :)