Could be TIA's (little strokes) or, it could be Bell's Palsy.
I copied this info from the Mayo Clinic site, it sounds like what you described.
Signs and symptoms of Bell's palsy come on suddenly, and may include:
■Rapid onset of mild weakness to total paralysis on one side of your face — occurring within hours to days — making it difficult to smile or close your eye on the affected side
■Facial droop and difficulty making facial expressions
■Pain around the jaw or in or behind your ear on the affected side
■Increased sensitivity to sound on the affected side
■Headache
■A decrease in your ability to taste
■Changes in the amount of tears and saliva you produce
In rare cases, Bell's palsy can affect the nerves on both sides of your face.
When to see a doctor
Seek immediate medical help if you experience paralysis, because you may be having a stroke. Actual Bell's palsy is not caused by a stroke.
See your doctor if you experience facial weakness or drooping, to determine the underlying cause and severity of the illness.
tia.s little trans ischemic attacks to the brain without t the full damage of stroke
When was the test taken? If in the past twenty four to about thirty eight hours of a stoke you might want to have the person receive another CT and or MRI.
How old is this person? If this person is older they could have had a grandma seizure which represents signs of a stroke
I would also ask the doctor to take a full urine check and make sure that the electrolytes are at a sustainable level. Magnesium (low) can be very hard on the body and is vital to ones health so definitely ask the doctor as to whether the renal function of the patient is at a good level.
Please ask if you have any further questions. Hope this helps for you