Except, you know, there's the law I could refer to.

Or like two months ago when the guy who hired me wanted me to ship software that was clearly going to explode in production and I told him that I'm not interested in having that kind of disaster on my conscience and that he would just have to deal with the fact that its going to take longer to ship.

Saying no is about having a spine, not about being able to hide behind something that you can hold against your employer. Maybe they're right. If you are incapable of making decisions in a professional fashion, you should not call yourself an engineer.