I hate running into this kind of stuff, I too have learned to go way out of my way to avoid finding out something I have nothing to gain from knowing.
Sometimes you can't - sometimes it hits you even though you aren't actively looking for it, but I've gone so far as to refuse to do RAH's laundry because I'm not cleaning out pockets, lol. When he leaves his binder/papers all over the kitchen table with his DUI/court stuff I stack it all & move it to his dresser but I stop myself from actually looking at any of it. I really don't want to know, nor do I want to tempt the codie triggers inside of me to get too involved. It's hard at first, but gets easier & for me it's very freeing to detach in that way!