complete pass

Question
You would admit, though, that there is a bit of grey area here, no?  Let's make a hypothetical: the quarterback throws a forward pass, and a receiver seems to have possession of it for less than a second, and a defensive player from the other team tackle him so hard that the receiver drops the ball.  How will a judge rule whether it's a fumble or not?

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Followup To
Question -
Okay, it may not be a rule, but I think I've heard that a method that judges use to rule whether a ball is in possession is that the receiver has the ball and runs for a few steps.  Isn't this true?  And what about this, I found this on Wikipedia.com:

"An incomplete pass, is a term in american football which means that the intended receiver does not catch the ball. For example, if the quarter-back throws the ball to one of his wide receivers, and he either does not touch it, or tries to catch it unsuccessfully, it is ruled as an incomplete pass. If this happens the down advances one, and the offenceive team gains no yards. However, if he catches the ball, has control for three seconds, then drops it, it is rulled a fumble."

Is this passage from Wikipedia.com correct?

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Followup To
Question -
Isn't there a rule that the receiver is considered to have possession if he holds on to the ball for three seconds, or something like that?

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Followup To
Question -
During a passing play, the quarterback throws a forward pass, and a receiver got a hold of the ball for one second, and somebody from the defense of the other team knocked it out of his hand, is that an incomplete pass?  What are the criteria for determining whether it was incomplete or a fumble?
Answer -
 It depends on whether or not the receiver had possession of the ball.  Possession is defined as:

 When a player controls the ball throughout the act of clearly touching both feet, or any other part of his body other than his hand(s), to the ground inbounds.

 If the receiver had possession of the ball, then you described a fumble.  If the player did not have possession, then it was an incomplete pass.

Answer -
No.

Possesion is:

When a player controls the ball throughout the act of clearly touching both feet, or any other part of his body other than his hand(s), to the ground inbounds.
Answer -
Nope - ole Wikipedia is all wrong.  There is nothing in the NFL Rules for Officials about three seconds.

Possesion is:
When a player controls the ball throughout the act of clearly touching both feet, or any other part of his body other than his hand(s), to the ground inbounds.  

Answer
Nope - it is not a grey area.  Either he has possession or not, possession being:
"When a player controls the ball throughout the act of clearly touching both feet, or any other part of his body other than his hand(s), to the ground inbounds."

That is certainly a judgement call, but it is not a grey area.