You need to realize that a health care directive is not filed with law enforcement. It is usually given to one's treating physician as well as family members in conjunction with a proper power of attorney.In the situation that you are writing about, law enforcement had no idea if a medical directive existed with respect to your mother when they responded. Their job is to protect and preserve life which they apparently did with your mother. Had they not done their job to protect and preserve life when they responded, the officers would possibly be subject to a lawsuit for not fulfilling their duties.