there is no Occam's razor when you're doing an in depth investigation. Either they do a cursory DNA test or they try testing the father too, and then everything

there is no Occam's razor when you're doing an in depth investigation. Either they do a cursory DNA test or they try testing the father too, and then everything is in depth. (well I come form a country where the judicial system is inquisitory, not accusatory, so maybe I'm biased in my point of view)