No, you cannot.
Only against the cops, you can change the statements before the Magistrate if you can prove that your statements recorded were under threat and torture by the police.
Added: You can if you wish to. However, depending on whose behalf you are testifying, either the prosecution or the defense will use your changed statements to impeach your veracity thus throwing doubt on your entire testimony.
In a legal court proceeding where the statement of the witness is vital for the trial, yes the witness is subjected to law. But in case witness has some doubts or is binded by some agreement then law cannot punish the witness.
What witness statement, in what case?
yes
On witness's statement to investigators - no. On the usability and admissability of them in court - yes.
The witness might be punished for perjury, altho I doubt it.
the little boy with the ball
A person who gives a statement is called a witness.
Hearsay
Absolutely.
This is hearsay, which is a secondary source of information that is not allowed.
Yes, a written witness statement can be used as evidence in small claims court. It is important for the statement to be signed and dated by the witness, and ideally notarized for added credibility. The court will consider the witness statement along with other evidence presented during the case.
In some legal systems, the offender may have the right to see the witness statement, but usually personal information is redacted to protect the witness's privacy. The court usually determines what information can be disclosed to the offender.
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.