If you think that the testimony of an eight year old child is going to be very helpful, your level of knowledge of what actually happens in courtrooms isn't quite as extensive as I had previously thought. The boy doesn't even have to take the stand, unless the prosecutor wants to look like a piece of ****, going after an 8 y/o on the witness stand.
And, since he has already made a statement and someone tries to influence him into changing his account, that's called "witness tampering", another crime.
Here are a few questions which any competent lawyer would want the child to answer:
- "Do you know the difference between 'holding a gun', 'pointing a gun', and 'aiming a gun'?"
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- "Did you see who was outside the window?"
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- "Did your Aunt say anything about what was outside the window?"
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- "Did the person outside the window say anything before your Aunt was shot?"
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- "Did you hear anyone say that they were a police officer before your Aunt was shot?"
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- "What were you doing right before your Aunt was shot?"
However, you are quite correct that he will have a chance to take the witness stand and tell the court "what he thought". Of course, that will also mean that he will end up getting cross-examined by the Prosecution AND it will also mean that the "trier of fact" will have the opportunity to (in effect) "Do you actually expect any rational person to believe that crap?".
Not only are those questions ones that the Prosecution (AND the Defence) want to know the answers to, but they are BOTH highly likely to know the answers even before the questions get asked in court.