In other words: all it needs for your paper to have fraud is for your lab partner to add fraud to your paper. I'm not seeing the problem here. The only problem

In other words: all it needs for your paper to have fraud is for your lab partner to add fraud to your paper. I'm not seeing the problem here. The only problem is that your lab partner should be banned and not you. But being incentivised to check your co-author's work before submission isn't a bad thing.