I'm wondering if the hospital snoopers were doing things like looking at blood types of the babies..of course that isn't a tell-all.In Jeffrey MacDonald's case,all 4 family members had different blood types,yet the children were biologically theirs.Very rare,but it can happen.(one of the things that helped get him locked up for good..it produced a specific blood trail).But I'm guessing it might help give to a preliminary determination,in this instance.