Quick way of identifying a potential stroke victim

There is an email that is circulating and that is actually spreading valid information. A change from all those hoax emails spreading urban legends.

As usual, I checked snopes for the veracity of the information and it appears to be genuine. The three step method consist in asking the suspected stroke victim to:
smile
raise their arms
repeat a simple sentence coherently (the sun is bright today)

If the person fails at any one of those three simple tests, one should immediately call 911. There are new drugs that, if administered within 3 hours of a stroke, can limit disability from strokes caused by clots. This means that time is of the essence.

Of course, don't go about asking anybody to smile, raise their arms, etc. There has to be a just cause for concern, such as a person dropping on the floor (loss of balance, diziness) which they would dismiss as just losing their footing. But if the fall looks suspicious (no ice, no slippery surface, no uneveness on the walking surface, etc...) then use the fall as an excuse to do a quick physical check up. After all, the person did fall and could have twisted or broken something. Then, follow the check up with the three step test.

In a scuba diving situation, someone who is victim of a decompression sickness could show similar signs. A diver trained in neurological assessment could probably spot the subtelties. But whether a diver is the victim of a stroke or a deco sickness, in both cases, speed of intervention is important. Scubadivers should be especially conscious of such signs and act on them. Because of the bends, some of those signs.