I'm curious as to how police departments and DA offices operate, I would assume they would want/need a judge or at least a lawyer to look over their polices & p

I'm curious as to how police departments and DA offices operate, I would assume they would want/need a judge or at least a lawyer to look over their polices & procedures. If property is seized under an uncostitutional program or if someone is wrongly convicted... I would assume their city/county could be liable?