What witness statement, in what case?
yes
On witness's statement to investigators - no. On the usability and admissability of them in court - yes.
Most probably the same as you'd write in the funeral guestbook of a person who wasn't a Jehovah's Witness.
I think you mean written statement. What you are asking about write statement you are confusing with written statement, the same with write in statement. A written statement is simply putting your words, or your version of events in writing.
Hearsay
Absolutely.
This is hearsay, which is a secondary source of information that is not allowed.
how to write a statement to the University of Art and Culture
An incident statement would have the date, time, place, and name of any injured parties. It would also need to have a section that told, in the witness' own words, what happened. There also needs to be a section that tells what, if any, aid the injured party was given. At the bottom would be a space for date and signatures of both a manager and a witness.
The most common method of impeaching witness testimony is with a prior inconsistent statement. For example, if a bystander witness watches an accident, she will give a statement to a police officer at the scene. If she told the officer that the traffic light was red, but later testified that the light was green, her statement in the police report could be used to discredit, or impeach, her testimony.
The witness' statement innocently convicted the defendant.