The OP wrote this:
I responded with what she said in the video (paraphrasing) that she gave LE permission to search whatever they needed to.
Clinics may or may not ask the name of the person with you, but if the clinic knew about the DV charges of alleged battery of a pregnant woman in front of a minor and separation/restraining order, they may have made a note in the records that the father was or wasnt present even if it isnt something they generally do.
How would they have known about the DV/separation/RO? She may have had an appointment not long after the DV incident and showed obvious signs of injury. Arent medical professionals trained to ask about those things if they notice injuries on a patient? Also, at a previous appointment KN could have mentioned the DV/separation/RO, in conversation with a staff member. (Wheres your husband today? Well after he [DV], I kicked him out and got a RO.) Then he shows up with her at an appointment (may have also been prior to February 13) so staff members may have made notes as to his presence or lack thereof after the DV incident, even if they hadnt prior to it, because of the DV.
We dont know what has been recorded in her file. The only thing relevant in it would be if DN was at the ultrasound. If he wasnt, were back where we started because his not being at the ultrasound does not guarantee he was at the MHB committing a double homicide.