Daniel does not owe Jennifer an explanation. She had told him many times that her first priority is her family and her son. She also told Daniel that she did not want to be involved with him. Therefore Daniel is free to do whatever he wishes without any thought to her!! She also had no right to acost him on the floor of the hospital. She was so out of line that she could be suspended from her job.
He also doesn’t owe an explanatin to Hope or Maggie because Hope is asking as a private citizen, not a cop. I don’t think it would have matter what he said because Jen wouldn’t listen anyway.
I am not sure that Anne had the authority to ask for blood work to test for drugs on Daniel.